Online co-op Space Sim games

Every online co-op Space Sim game on Steam we know of, newest first. Add tags or a price band to narrow it down.

Showing 1–10 of 81 games matching Space Sim Β· updated 12 Oct 2026

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Free
Released
Price
Free
Players
πŸ‘₯ Not stated
Reviews
100% of 1

Free online 2D space combat with PvPvE. Pick a faction, upgrade your ship and take on other pilots and hostile fleets in PvP, wave-based wormholes, bosses, weekly events and clan wars across more than 20 maps.

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$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ Up to 4 players
Reviews
88% of 96

Command your ship and fleet in a galaxy that truly lives: 150 sectors where six factions mine, haul, trade, build and wage war whether you're there or not. Trade it, rob it, defend it β€” or forge your own fleet and carve out your place in it. Play solo or in online co-op.

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ 1–4 players
Reviews
100% of 1

Oh Ship! is a 1–4 player co-op space survival game where you and your crew coordinate to keep your ship running while space actively tries to destroy it. Salvage wrecks, fix systems, upgrade your ship, and survive the chaos.

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
100% of 1

Mine the belts, colonize distant worlds, and choose your allies as three rival factions fight over a fractured frontier, then prestige through five starships and lead a joint fleet against the invading Dominion.

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$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ Not stated

A SciFi MMORPG: WoW in space, inspired by the classic Subspace. Join one of four warring factions, pick from six classes and 16 ships, and level to 100 through story quests, world bosses, battlegrounds and fast dogfights. Squad up, trade on your faction's Auction House and fight for the galaxy.

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
73% of 19

Spiritus Astrum is a persistent, open-world roleplaying sandbox with multiplayer support. It features an infinite, procedurally generated universe which players are free to explore without restriction. Spiritus Astrum is more than a game, it is a world.

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ 2–4 players
Reviews
66% of 3

An incremental swarm tower defense. Play solo or 2–4 player Steam co-op. Defend a doomed mining colony through a full campaign, infinite procedural maps and Workshop creations. Build towers. Call orbital strikes. Kill billions. The only good bug is a dead bug. Do your part!

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
69% of 43

Sigma World Online - is an online sandbox with a huge world from many star systems. Choose who to be: space explorer, miner, merchant, farmer, culinary specialist, scientist, builder or hunter, or build your empire.

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Free
Released
Price
Free
Players
πŸ‘₯ Not stated
Reviews
100% of 1

-Fight others in PvP with movement and physics of a classic. -Survive SOLO or COOP in waves mode. -Use different weapons and powerups to survive. -Get to top of leaderboards