Games like Coral Island
Games like Coral Island include Stardew Valley, My Time at Portia, Sun Haven, My Time at Sandrock, and Fields of Mistria. We matched them by the tags players give Coral Island on Steam (Farming Sim, Life Sim, Dating Sim, Relaxing, and Simulation): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Farming Sim · Life Sim · Relaxing

My Time at Portia
Shared: Life Sim · Farming Sim · RPG

Sun Haven
Shared: Farming Sim · Life Sim · Dating Sim

My Time at Sandrock
Shared: Life Sim · Farming Sim · Dating Sim

Fields of Mistria
Shared: Farming Sim · Dating Sim · Life Sim

The Sims™ 4
Shared: Life Sim · Simulation · Character Customization

Clanfolk
Shared: Farming Sim · Life Sim · Relaxing

Dinkum
Shared: Farming Sim · Relaxing · Life Sim

Disney Dreamlight Valley
Shared: Life Sim · Relaxing · Simulation

I Am Future: Cozy Apocalypse Survival
Shared: Farming Sim · Simulation · Agriculture

Farmer's Dynasty - Final Harvest Edition
Shared: Farming Sim · Life Sim · Simulation

Paralives
Shared: Life Sim · Simulation · Character Customization

Littlewood
Shared: Life Sim · Relaxing · Simulation

Tales of Seikyu
Shared: Farming Sim · Life Sim · Dating Sim

STORY OF SEASONS: Friends of Mineral Town
Shared: Farming Sim · Dating Sim · Simulation

Starsand Island
Shared: Farming Sim · Life Sim · RPG

Palia
Shared: Life Sim · Farming Sim · Relaxing

Song Of The Prairie
Shared: Farming Sim · Life Sim · Agriculture

Potion Craft: Alchemist Simulator
Shared: Relaxing · Simulation · Crafting

The Sims™ 3
Shared: Life Sim · Simulation · Character Customization

Infinity Nikki
Shared: Relaxing · RPG · Life Sim

inZOI
Shared: Life Sim · Simulation · Character Customization

No Place Like Home
Shared: Farming Sim · Life Sim · RPG

Farm Together
Shared: Agriculture · Relaxing · Simulation