Games like Game Master Module
Games like Game Master Module include Tabletop Simulator, TaleSpire, Mount & Blade II: Bannerlord, Totally Accurate Battle Simulator, and Garry's Mod. We matched them by the tags players give Game Master Module on Steam (Simulation, Sandbox, Board Game, Tabletop, and 3D): closest matches first, and among equally close ones the better-known games.

Tabletop Simulator
Shared: Simulation · Board Game · Tabletop

TaleSpire
Shared: Tabletop · Level Editor · Simulation

Mount & Blade II: Bannerlord
Shared: Sandbox · Simulation · Multiplayer

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Singleplayer

Garry's Mod
Shared: Sandbox · Multiplayer · Simulation

Bloons TD 6
Shared: Singleplayer · Multiplayer · Sandbox

Stardew Valley
Shared: Simulation · Sandbox · Multiplayer

鬼谷八荒 Tale of Immortal
Shared: Simulation · Sandbox · Singleplayer

Prison Architect
Shared: Simulation · Sandbox · Top-Down

UNO
Shared: Board Game · Tabletop · Multiplayer

House Flipper
Shared: Simulation · Sandbox · Singleplayer

Farming Simulator 22
Shared: Simulation · Sandbox · Multiplayer

Besiege
Shared: Simulation · Sandbox · Multiplayer

Talisman: Digital Classic Edition
Shared: Board Game · Tabletop · Multiplayer

Anno 1800
Shared: Simulation · Sandbox · Multiplayer

Crusader Kings II
Shared: Simulation · Sandbox · Strategy

Planet Coaster 2
Shared: Simulation · Sandbox · 3D

Teardown
Shared: Sandbox · Multiplayer · Singleplayer

BeamNG.drive
Shared: Simulation · Sandbox · Multiplayer

PowerWash Simulator
Shared: Simulation · Sandbox · 3D

Mount & Blade: Warband
Shared: Sandbox · Multiplayer · RPG

Space Engineers
Shared: Sandbox · Simulation · Multiplayer

The Escapists 2
Shared: Simulation · Multiplayer · Sandbox

Car Mechanic Simulator 2021
Shared: Simulation · Sandbox · Singleplayer