diff --git a/app_legacy.go b/app_legacy.go
index 4c53e37b3527..2a8318363be3 100644
--- a/app_legacy.go
+++ b/app_legacy.go
@@ -27,6 +27,8 @@ import (
 	"github.com/cosmos/cosmos-sdk/server/api"
 	"github.com/cosmos/cosmos-sdk/server/config"
 	servertypes "github.com/cosmos/cosmos-sdk/server/types"
+	simappparams "github.com/cosmos/cosmos-sdk/simapp/params"
+	"github.com/cosmos/cosmos-sdk/std"
 	"github.com/cosmos/cosmos-sdk/store/streaming"
 	storetypes "github.com/cosmos/cosmos-sdk/store/types"
 	"github.com/cosmos/cosmos-sdk/testutil/testdata_pulsar"
@@ -211,7 +213,7 @@ func NewSimApp(
 	appOpts servertypes.AppOptions,
 	baseAppOptions ...func(*baseapp.BaseApp),
 ) *SimApp {
-	encodingConfig := MakeTestEncodingConfig()
+	encodingConfig := makeEncodingConfig()
 
 	appCodec := encodingConfig.Codec
 	legacyAmino := encodingConfig.Amino
@@ -684,3 +686,12 @@ func initParamsKeeper(appCodec codec.BinaryCodec, legacyAmino *codec.LegacyAmino
 
 	return paramsKeeper
 }
+
+func makeEncodingConfig() simappparams.EncodingConfig {
+	encodingConfig := simappparams.MakeTestEncodingConfig()
+	std.RegisterLegacyAminoCodec(encodingConfig.Amino)
+	std.RegisterInterfaces(encodingConfig.InterfaceRegistry)
+	ModuleBasics.RegisterLegacyAminoCodec(encodingConfig.Amino)
+	ModuleBasics.RegisterInterfaces(encodingConfig.InterfaceRegistry)
+	return encodingConfig
+}
diff --git a/encoding.go b/encoding.go
deleted file mode 100644
index 8a90ff852478..000000000000
--- a/encoding.go
+++ /dev/null
@@ -1,19 +0,0 @@
-package simapp
-
-import (
-	simappparams "github.com/cosmos/cosmos-sdk/simapp/params"
-	"github.com/cosmos/cosmos-sdk/std"
-)
-
-// MakeTestEncodingConfig creates an EncodingConfig for testing. This function
-// should be used only in tests or when creating a new app instance (NewApp*()).
-// App user shouldn't create new codecs - use the app.AppCodec instead.
-// [DEPRECATED]
-func MakeTestEncodingConfig() simappparams.EncodingConfig {
-	encodingConfig := simappparams.MakeTestEncodingConfig()
-	std.RegisterLegacyAminoCodec(encodingConfig.Amino)
-	std.RegisterInterfaces(encodingConfig.InterfaceRegistry)
-	ModuleBasics.RegisterLegacyAminoCodec(encodingConfig.Amino)
-	ModuleBasics.RegisterInterfaces(encodingConfig.InterfaceRegistry)
-	return encodingConfig
-}
diff --git a/simd/cmd/genaccounts_test.go b/simd/cmd/genaccounts_test.go
index ca751fc34f62..34dc5e3071ff 100644
--- a/simd/cmd/genaccounts_test.go
+++ b/simd/cmd/genaccounts_test.go
@@ -16,10 +16,11 @@ import (
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/client/flags"
 	"github.com/cosmos/cosmos-sdk/server"
-	"github.com/cosmos/cosmos-sdk/simapp"
 	simcmd "github.com/cosmos/cosmos-sdk/simapp/simd/cmd"
 	"github.com/cosmos/cosmos-sdk/testutil/testdata"
 	"github.com/cosmos/cosmos-sdk/types/module"
+	moduletestutil "github.com/cosmos/cosmos-sdk/types/module/testutil"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 	"github.com/cosmos/cosmos-sdk/x/genutil"
 	genutiltest "github.com/cosmos/cosmos-sdk/x/genutil/client/testutil"
 )
@@ -73,7 +74,7 @@ func TestAddGenesisAccountCmd(t *testing.T) {
 			cfg, err := genutiltest.CreateDefaultTendermintConfig(home)
 			require.NoError(t, err)
 
-			appCodec := simapp.MakeTestEncodingConfig().Codec
+			appCodec := moduletestutil.MakeTestEncodingConfig(auth.AppModuleBasic{}).Codec
 			err = genutiltest.ExecInitCmd(testMbm, home, appCodec)
 			require.NoError(t, err)
 
diff --git a/simd/cmd/testnet_test.go b/simd/cmd/testnet_test.go
index 09134383a16c..716e9f862b23 100644
--- a/simd/cmd/testnet_test.go
+++ b/simd/cmd/testnet_test.go
@@ -13,14 +13,17 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/flags"
 	"github.com/cosmos/cosmos-sdk/server"
 	"github.com/cosmos/cosmos-sdk/simapp"
+	moduletestutil "github.com/cosmos/cosmos-sdk/types/module/testutil"
+	"github.com/cosmos/cosmos-sdk/x/auth"
 	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
 	genutiltest "github.com/cosmos/cosmos-sdk/x/genutil/client/testutil"
 	genutiltypes "github.com/cosmos/cosmos-sdk/x/genutil/types"
+	"github.com/cosmos/cosmos-sdk/x/staking"
 )
 
 func Test_TestnetCmd(t *testing.T) {
 	home := t.TempDir()
-	encodingConfig := simapp.MakeTestEncodingConfig()
+	encodingConfig := moduletestutil.MakeTestEncodingConfig(staking.AppModuleBasic{}, auth.AppModuleBasic{})
 	logger := log.NewNopLogger()
 	cfg, err := genutiltest.CreateDefaultTendermintConfig(home)
 	require.NoError(t, err)