Games like Absolute Sol
Games like Absolute Sol include Kerbal Space Program, Universe Sandbox, Kerbal Space Program 2, Hardspace: Shipbreaker, and Universe Sandbox. We matched them by the tags players give Absolute Sol on Steam (Simulation, Sandbox, Early Access, Education, and Physics): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Simulation · Sandbox · Space

Universe Sandbox
Shared: Simulation · Sandbox · Physics

Kerbal Space Program 2
Shared: Sandbox · Space · Simulation

Hardspace: Shipbreaker
Shared: Simulation · Space · Physics

Universe Sandbox
Shared: Simulation · Sandbox · Physics

SpaceEngine
Shared: Sandbox · Sci-fi · Space

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

BeamNG.drive
Shared: Simulation · Physics · Sandbox

Spaceflight Simulator
Shared: Sandbox · Simulation · Space

Space Engineers
Shared: Sandbox · Simulation · Space

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Physics

Space Engineers 2
Shared: Sandbox · Simulation · Space

Garry's Mod
Shared: Sandbox · Physics · Simulation

People Playground
Shared: Sandbox · Physics · Simulation

PC Building Simulator
Shared: Simulation · Education · Sandbox

Stellaris
Shared: Space · Sandbox · Simulation

Dyson Sphere Program
Shared: Simulation · Space · Sandbox

Poly Bridge
Shared: Simulation · Physics · Sandbox

X4: Foundations
Shared: Simulation · Sandbox · Space

Car Mechanic Simulator 2021
Shared: Simulation · Sandbox · Singleplayer

SPORE™
Shared: Sandbox · Simulation · Space

Automation - The Car Company Tycoon Game
Shared: Simulation · Sandbox · Early Access

Flyout
Shared: Simulation · Sandbox · Physics

Steam Engine Simulator
Shared: Simulation · Education · Physics