diff --git a/address.go b/address.go
index 4333fe423..d7e52706b 100644
--- a/address.go
+++ b/address.go
@@ -108,8 +108,6 @@ func chainCustomizer(chain ChainID) uint64 {
 		return 0
 	case Testnet:
 		return invalidCodeTestNetwork
-	case Sandboxnet:
-		return invalidCodeSandboxNetwork
 	case Emulator, Localnet, Benchnet, BftTestnet:
 		return invalidCodeTransientNetwork
 	default:
@@ -268,9 +266,6 @@ const (
 
 	// invalidCodeTransientNetwork  is the invalid codeword used for transient test networks.
 	invalidCodeTransientNetwork = uint64(0x1cb159857af02018)
-
-	// invalidCodeSandboxNetwork is the invalid codeword used for Sandbox network.
-	invalidCodeSandboxNetwork = uint64(0x1035ce4eff92ae01)
 )
 
 // Rows of the generator matrix G of the [64,45]-code used for Flow addresses.
diff --git a/flow.go b/flow.go
index 14e938a95..e27c51e3b 100644
--- a/flow.go
+++ b/flow.go
@@ -104,9 +104,6 @@ const (
 	// Testnet is the chain ID for the testnet chain.
 	Testnet ChainID = "flow-testnet"
 
-	// Sandboxnet is the chain ID for sandboxnet chain.
-	Sandboxnet ChainID = "flow-sandboxnet"
-
 	// Transient test networks
 
 	// Benchnet is the chain ID for the transient benchmarking chain.