Games like People Playground
Games like People Playground include Garry's Mod, Blade and Sorcery, Goat Simulator, Kerbal Space Program, and BeamNG.drive. We matched them by the tags players give People Playground on Steam (Sandbox, Gore, Physics, Violent, and Moddable): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Sandbox · Physics · Moddable

Blade and Sorcery
Shared: Gore · Sandbox · Moddable

Goat Simulator
Shared: Sandbox · Physics · Simulation

Kerbal Space Program
Shared: Sandbox · Physics · Simulation

BeamNG.drive
Shared: Physics · Sandbox · Simulation

Happy Room
Shared: Gore · Sandbox · Violent

Mutilate-a-Doll 2
Shared: Sandbox · Gore · Physics

Happy Wheels
Shared: Gore · Sandbox · Physics

Totally Accurate Battle Simulator
Shared: Sandbox · Physics · Simulation

Besiege
Shared: Sandbox · Physics · Simulation

Space Engineers
Shared: Sandbox · Physics · Simulation

GoreBox
Shared: Sandbox · Gore · Physics

POSTAL 2
Shared: Violent · Sandbox · Gore

Forts
Shared: Physics · Sandbox · Moddable

Brick Rigs
Shared: Sandbox · Physics · Destruction

Teardown
Shared: Sandbox · Physics · Destruction

CARRION
Shared: Gore · Violent · 2D

STANDBOX
Shared: Sandbox · Gore · Violent

Just Cause 4 Reloaded
Shared: Sandbox · Singleplayer · Destruction

Turbo Dismount™
Shared: Physics · Sandbox · Simulation

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

Fireworks Mania - An Explosive Simulator
Shared: Sandbox · Physics · Singleplayer

Ultimate Ragdoll Game
Shared: Sandbox · Gore · Physics

Hot Dogs, Horseshoes & Hand Grenades
Shared: Sandbox · Physics · Simulation