Games like Sheep Island
Games like Sheep Island include Stardew Valley, WorldBox - God Simulator, People Playground, Sand:box, and Reus. We matched them by the tags players give Sheep Island on Steam (Simulation, Sandbox, God Game, 2D, and Cute): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Pixel Graphics · Simulation · Sandbox

WorldBox - God Simulator
Shared: Sandbox · Simulation · God Game

People Playground
Shared: Sandbox · 2D · Simulation

Sand:box
Shared: Simulation · Sandbox · 2D

Reus
Shared: God Game · Simulation · Sandbox

SPORE™
Shared: God Game · Sandbox · Simulation

Planet Zoo
Shared: Simulation · Sandbox · Nature

Prison Architect
Shared: Simulation · Sandbox · 2D

Potion Craft: Alchemist Simulator
Shared: Simulation · Relaxing · 2D

Unpacking
Shared: Cute · Relaxing · Pixel Graphics

Graveyard Keeper
Shared: Simulation · Pixel Graphics · Sandbox

Terraria
Shared: Sandbox · 2D · Pixel Graphics

Equilinox
Shared: Simulation · Sandbox · God Game

Fields of Mistria
Shared: Simulation · Pixel Graphics · Cute

Maltese's Fluffy Onsen
Shared: Simulation · Pixel Graphics · Cute

Universe Sandbox
Shared: Simulation · Sandbox · God Game

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

The Escapists
Shared: Simulation · Pixel Graphics · 2D

Planet Coaster
Shared: Simulation · Sandbox · Relaxing

The Sims™ 4
Shared: Simulation · Sandbox · Singleplayer

Tiny Glade
Shared: Sandbox · Relaxing · Cute

Sticky Business
Shared: Simulation · Cute · Relaxing

DAVE THE DIVER
Shared: Pixel Graphics · Relaxing · Simulation

House Flipper
Shared: Simulation · Sandbox · Singleplayer