Games like Rover Builder
Games like Rover Builder include Kerbal Space Program, Space Engineers, Kerbal Space Program 2, Garry's Mod, and Besiege. We matched them by the tags players give Rover Builder on Steam (Sandbox, Building, Physics, Simulation, and Robots): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Sandbox · Simulation · Physics

Space Engineers
Shared: Sandbox · Building · Simulation

Kerbal Space Program 2
Shared: Sandbox · Building · Physics

Garry's Mod
Shared: Sandbox · Physics · Building

Besiege
Shared: Sandbox · Simulation · Physics

Totally Accurate Battle Simulator
Shared: Sandbox · Simulation · Physics

Poly Bridge
Shared: Building · Physics · Simulation

Poly Bridge 2
Shared: Building · Physics · Sandbox

People Playground
Shared: Sandbox · Physics · Simulation

Universe Sandbox
Shared: Sandbox · Simulation · Physics

Aviassembly
Shared: Building · Physics · Sandbox

Cities: Skylines
Shared: Building · Simulation · Sandbox

Space Engineers 2
Shared: Sandbox · Building · Simulation

Hardspace: Shipbreaker
Shared: Physics · Simulation · Sandbox

Bridge Constructor Portal
Shared: Simulation · Physics · Building

Spaceflight Simulator
Shared: Sandbox · Simulation · Space

Dyson Sphere Program
Shared: Building · Space · Simulation

Planet Coaster
Shared: Building · Sandbox · Simulation

Scrap Mechanic
Shared: Sandbox · Building · Physics

Solar Expanse - Space Exploration Manager
Shared: Sandbox · Simulation · Physics

Prison Architect
Shared: Building · Sandbox · Simulation

Planet Coaster 2
Shared: Sandbox · Simulation · Building

Cities: Skylines II
Shared: Building · Sandbox · Simulation

From the Depths
Shared: Sandbox · Building · Physics