Games like Teardown
Games like Teardown include BeamNG.drive, Garry's Mod, Besiege, Brick Rigs, and People Playground. We matched them by the tags players give Teardown on Steam (Destruction, Physics, Sandbox, Voxel, and Multiplayer): closest matches first, and among equally close ones the better-known games.

BeamNG.drive
Shared: Physics · Destruction · Sandbox

Garry's Mod
Shared: Sandbox · Physics · Multiplayer

Besiege
Shared: Physics · Sandbox · Destruction

Brick Rigs
Shared: Destruction · Sandbox · Physics

People Playground
Shared: Sandbox · Physics · Destruction

Wreckfest
Shared: Destruction · Physics · Multiplayer

Totally Accurate Battle Simulator
Shared: Sandbox · Physics · Singleplayer

Just Cause™ 3
Shared: Destruction · Multiplayer · Sandbox

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

Forts
Shared: Physics · Destruction · Multiplayer

Goat Simulator
Shared: Sandbox · Physics · Destruction

Scrap Mechanic
Shared: Sandbox · Physics · Multiplayer

Space Engineers
Shared: Sandbox · Physics · Multiplayer

PEAK
Shared: Multiplayer · Physics · Co-op

How to Fish
Shared: Multiplayer · Physics · Indie

Human Fall Flat
Shared: Physics · Multiplayer · Sandbox

CarX Drift Racing Online
Shared: Multiplayer · Sandbox · Physics

RV There Yet?
Shared: Multiplayer · Physics · Co-op

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

Storm Chasers
Shared: Multiplayer · Indie · Physics

Hardspace: Shipbreaker
Shared: Physics · Destruction · Sandbox

Medieval Engineers
Shared: Sandbox · Physics · Destruction

Turbo Dismount™
Shared: Physics · Destruction · Sandbox

Bloons TD 6
Shared: Multiplayer · Singleplayer · Sandbox