Games like Snap Game
Games like Snap Game include Garry's Mod, Space Engineers, Scrap Mechanic, Besiege, and Brick Rigs. We matched them by the tags players give Snap Game on Steam (Multiplayer, Sandbox, Simulation, Physics, and Building): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Sandbox · Multiplayer · Physics

Space Engineers
Shared: Sandbox · Building · Simulation

Scrap Mechanic
Shared: Sandbox · Multiplayer · Building

Besiege
Shared: Sandbox · Simulation · Physics

Brick Rigs
Shared: Sandbox · Multiplayer · Building

Teardown
Shared: Sandbox · Physics · Multiplayer

BeamNG.drive
Shared: Simulation · Physics · Sandbox

Fireworks Mania - An Explosive Simulator
Shared: Multiplayer · Sandbox · Building

House Flipper
Shared: Simulation · Multiplayer · Sandbox

Kerbal Space Program
Shared: Sandbox · Simulation · Physics

Totally Accurate Battle Simulator
Shared: Sandbox · Simulation · Physics

People Playground
Shared: Sandbox · Physics · Simulation

Fun with Ragdolls: The Game
Shared: Sandbox · Physics · Simulation

Stardew Valley
Shared: Multiplayer · Simulation · Sandbox

Supermarket Simulator
Shared: Multiplayer · Simulation · Singleplayer

Goat Simulator 3
Shared: Sandbox · Physics · Simulation

Car Mechanic Simulator 2018
Shared: Simulation · Multiplayer · Building

Poly Bridge
Shared: Simulation · Physics · Building

CarX Drift Racing Online
Shared: Multiplayer · Simulation · Sandbox

Waterpark Simulator
Shared: Multiplayer · Simulation · Sandbox

The Sims™ 3
Shared: Simulation · Sandbox · Building

Medieval Engineers
Shared: Sandbox · Building · Physics

The Sims™ 4
Shared: Simulation · Building · Sandbox

Crazy Machines 3
Shared: Simulation · Physics · Sandbox