diff --git a/CHANGELOG.md b/CHANGELOG.md
index 52fee5cc91f0..7a049c5b1437 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -82,6 +82,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [#12398](https://github.com/cosmos/cosmos-sdk/issues/12398) Refactor all `x` modules to unit-test via mocks and decouple `simapp`.
 * [#13144](https://github.com/cosmos/cosmos-sdk/pull/13144) Add validator distribution info grpc gateway get endpoint.
 * [#13168](https://github.com/cosmos/cosmos-sdk/pull/13168) Migrate tendermintdev/proto-builder to ghcr.io. New image `ghcr.io/cosmos/proto-builder:0.8`
+* [#13233](https://github.com/cosmos/cosmos-sdk/pull/13233) Add `--append` to `add-genesis-account` sub-command to append new tokens after an account is already created.
 * [#13236](https://github.com/cosmos/cosmos-sdk/pull/13236) Integrate Filter Logging
 
 ### State Machine Breaking
diff --git a/simapp/simd/cmd/genaccounts.go b/simapp/simd/cmd/genaccounts.go
index 97275a41fc43..862a061a4e20 100644
--- a/simapp/simd/cmd/genaccounts.go
+++ b/simapp/simd/cmd/genaccounts.go
@@ -24,6 +24,7 @@ const (
 	flagVestingStart = "vesting-start-time"
 	flagVestingEnd   = "vesting-end-time"
 	flagVestingAmt   = "vesting-amount"
+	flagAppendMode   = "append"
 )
 
 // AddGenesisAccountCmd returns add-genesis-account cobra Command.
@@ -130,38 +131,51 @@ contain valid denominations. Accounts may optionally be supplied with vesting pa
 				return fmt.Errorf("failed to get accounts from any: %w", err)
 			}
 
+			bankGenState := banktypes.GetGenesisStateFromAppState(clientCtx.Codec, appState)
 			if accs.Contains(addr) {
-				return fmt.Errorf("cannot add account at existing address %s", addr)
-			}
+				appendflag, _ := cmd.Flags().GetBool(flagAppendMode)
+				if !appendflag {
+					return fmt.Errorf("cannot add account at existing address %s", addr)
+				}
 
-			// Add the new account to the set of genesis accounts and sanitize the
-			// accounts afterwards.
-			accs = append(accs, genAccount)
-			accs = authtypes.SanitizeGenesisAccounts(accs)
+				genesisB := banktypes.GetGenesisStateFromAppState(clientCtx.Codec, appState)
+				for idx, acc := range genesisB.Balances {
+					if acc.Address != addr.String() {
+						continue
+					}
 
-			genAccs, err := authtypes.PackAccounts(accs)
-			if err != nil {
-				return fmt.Errorf("failed to convert accounts into any's: %w", err)
-			}
-			authGenState.Accounts = genAccs
+					updatedCoins := acc.Coins.Add(coins...)
+					bankGenState.Balances[idx] = banktypes.Balance{Address: addr.String(), Coins: updatedCoins.Sort()}
+					break
+				}
+			} else {
+				// Add the new account to the set of genesis accounts and sanitize the accounts afterwards.
+				accs = append(accs, genAccount)
+				accs = authtypes.SanitizeGenesisAccounts(accs)
 
-			authGenStateBz, err := clientCtx.Codec.MarshalJSON(&authGenState)
-			if err != nil {
-				return fmt.Errorf("failed to marshal auth genesis state: %w", err)
-			}
+				genAccs, err := authtypes.PackAccounts(accs)
+				if err != nil {
+					return fmt.Errorf("failed to convert accounts into any's: %w", err)
+				}
+				authGenState.Accounts = genAccs
 
-			appState[authtypes.ModuleName] = authGenStateBz
+				authGenStateBz, err := clientCtx.Codec.MarshalJSON(&authGenState)
+				if err != nil {
+					return fmt.Errorf("failed to marshal auth genesis state: %w", err)
+				}
+				appState[authtypes.ModuleName] = authGenStateBz
+
+				bankGenState.Balances = append(bankGenState.Balances, balances)
+			}
 
-			bankGenState := banktypes.GetGenesisStateFromAppState(clientCtx.Codec, appState)
-			bankGenState.Balances = append(bankGenState.Balances, balances)
 			bankGenState.Balances = banktypes.SanitizeGenesisBalances(bankGenState.Balances)
+
 			bankGenState.Supply = bankGenState.Supply.Add(balances.Coins...)
 
 			bankGenStateBz, err := clientCtx.Codec.MarshalJSON(bankGenState)
 			if err != nil {
 				return fmt.Errorf("failed to marshal bank genesis state: %w", err)
 			}
-
 			appState[banktypes.ModuleName] = bankGenStateBz
 
 			appStateJSON, err := json.Marshal(appState)
@@ -179,6 +193,7 @@ contain valid denominations. Accounts may optionally be supplied with vesting pa
 	cmd.Flags().String(flagVestingAmt, "", "amount of coins for vesting accounts")
 	cmd.Flags().Int64(flagVestingStart, 0, "schedule start time (unix epoch) for vesting accounts")
 	cmd.Flags().Int64(flagVestingEnd, 0, "schedule end time (unix epoch) for vesting accounts")
+	cmd.Flags().Bool(flagAppendMode, false, "append the coins to an account already in the genesis.json file")
 	flags.AddQueryFlagsToCmd(cmd)
 
 	return cmd