Games like Sandbox
Games like Sandbox include Terraria, Milo and the Magpies, Hidden Folks, Slime Rancher, and 鬼谷八荒 Tale of Immortal. We matched them by the tags players give Sandbox on Steam (Exploration, Incremental, Sandbox, Hidden Object, and Adventure): closest matches first, and among equally close ones the better-known games.
Terraria
Shared: Sandbox · Adventure · 2D
Milo and the Magpies
Shared: Exploration · Adventure · Hidden Object
Hidden Folks
Shared: Hidden Object · Point & Click · Relaxing
Slime Rancher
Shared: Exploration · Adventure · Sandbox
鬼谷八荒 Tale of Immortal
Shared: Sandbox · Exploration · Adventure
Disney Dreamlight Valley
Shared: Exploration · Relaxing · Adventure
The House of Da Vinci
Shared: Hidden Object · Exploration · Point & Click
Starbound
Shared: Sandbox · Adventure · Exploration
Don't Starve
Shared: Adventure · Sandbox · Exploration
DAVE THE DIVER
Shared: Exploration · Adventure · Relaxing
The Room 4: Old Sins
Shared: Adventure · Point & Click · Hidden Object
Potion Craft: Alchemist Simulator
Shared: Relaxing · Sandbox · 2D
Hollow Knight
Shared: Exploration · 2D · Adventure
Hollow Knight: Silksong
Shared: Exploration · 2D · Indie
A Game About Digging A Hole
Shared: Exploration · Sandbox · Adventure
A Short Hike
Shared: Exploration · Adventure · Relaxing
The Long Dark
Shared: Exploration · Adventure · Sandbox
100 hidden birds
Shared: Hidden Object · Adventure · Exploration
Carto
Shared: Exploration · Adventure · Indie
A Castle Full of Cats
Shared: Hidden Object · Point & Click · Relaxing
Digseum
Shared: Incremental · Relaxing · Minimalist
The Room
Shared: Point & Click · Adventure · Hidden Object
Morphopolis
Shared: Hidden Object · Point & Click · Adventure
Big Walk
Shared: Exploration · Adventure · Relaxing