Games like Sandbox Apocalypse
Games like Sandbox Apocalypse include 7 Days to Die, Project Zomboid, Kenshi, Rust, and VEIN. We matched them by the tags players give Sandbox Apocalypse on Steam (Sandbox, Zombies, Open World, Post-apocalyptic, and Survival): closest matches first, and among equally close ones the better-known games.

7 Days to Die
Shared: Zombies · Survival · Open World

Project Zomboid
Shared: Zombies · Open World · Survival

Kenshi
Shared: Sandbox · Open World · Survival

Rust
Shared: Survival · Open World · Sandbox

VEIN
Shared: Zombies · Open World · Survival

Valheim
Shared: Open World · Survival · Crafting

The Forest
Shared: Open World · Survival · Crafting

Core Keeper
Shared: Open World · Survival · Sandbox

SurrounDead
Shared: Zombies · Open World · Survival

Terraria
Shared: Sandbox · Survival · Crafting

Enshrouded
Shared: Open World · Survival · Base Building

Once Human
Shared: Open World · Survival · Exploration

DayZ
Shared: Zombies · Open World · Survival

Scrap Mechanic
Shared: Sandbox · Open World · Survival

ARK: Survival Evolved
Shared: Open World · Survival · Crafting

ARK: Survival Ascended
Shared: Open World · Survival · Sandbox

Satisfactory
Shared: Open World · Sandbox · Crafting

Conan Exiles Enhanced
Shared: Open World · Survival · Sandbox

Sons Of The Forest
Shared: Open World · Survival · Crafting

DYSMANTLE
Shared: Open World · Zombies · Survival

Raft
Shared: Survival · Open World · Crafting

The Long Dark
Shared: Open World · Survival · Exploration

Miscreated
Shared: Open World · Zombies · Survival

ZED ZONE
Shared: Zombies · Open World · Sandbox