Quick answer
OFFICIAL: Landscaper Simulator is a single-player game. Steam's official feature list includes Single-player, Steam Achievements, Family Sharing and controller options — no Co-op, no Multi-player, no LAN.
Could co-op come later?
UNVERIFIED: the developer has not announced any multiplayer mode. If you need co-op today, PowerWash Simulator added online co-op to that niche — compare offers in our PowerWash comparison or browse similar cozy cleanup games.
But what about Family Sharing?
Steam Family Sharing (OFFICIAL category) lets two family members in a household install and take turns playing a game they bought once. It is single-seat play — not simultaneous co-op. Sessions are solo either way.
Where to go next
Platform availability, controller support, or start with the Beginner Guide.