Games like Sapper
Games like Sapper include Besiege, Teardown, Poly Bridge, WorldBox - God Simulator, and Human Fall Flat. We matched them by the tags players give Sapper on Steam (Indie, Puzzle, Sandbox, Destruction, and Medieval): closest matches first, and among equally close ones the better-known games.

Besiege
Shared: Sandbox · Destruction · Medieval

Teardown
Shared: Destruction · Sandbox · Indie

Poly Bridge
Shared: Puzzle · Sandbox · Indie

WorldBox - God Simulator
Shared: Sandbox · Destruction · Indie

Human Fall Flat
Shared: Puzzle · Sandbox · Indie

Poly Bridge 2
Shared: Puzzle · Sandbox · Indie

People Playground
Shared: Sandbox · Destruction · Indie

Baba Is You
Shared: Indie · Puzzle · Level Editor

Moncage
Shared: Puzzle · Indie · Cartoon

Mount & Blade II: Bannerlord
Shared: Medieval · Sandbox · Indie

Medieval Engineers
Shared: Sandbox · Medieval · Destruction

Little Inferno
Shared: Indie · Puzzle · Sandbox

Goat Simulator
Shared: Sandbox · Indie · Destruction

Bendy and the Ink Machine
Shared: Puzzle · Indie · Cartoon

while True: learn()
Shared: Puzzle · Indie · Sandbox

Happy Wheels
Shared: Sandbox · Indie · Level Editor

There Is No Game: Wrong Dimension
Shared: Indie · Puzzle

Firework
Shared: Indie · Puzzle

LIMBO
Shared: Indie · Puzzle

Potion Craft: Alchemist Simulator
Shared: Indie · Medieval · Sandbox

Opus Magnum
Shared: Puzzle · Indie · Sandbox

Banished
Shared: Indie · Sandbox · Medieval

Graveyard Keeper
Shared: Sandbox · Indie · Medieval

Dorfromantik
Shared: Puzzle · Sandbox · Indie