Sandustry Mod Install Guide: Official Modding Tools, Steam Workshop & the Fluxloader Loader

Sandustry sits in the top tier of indie games when it comes to mod support: official native modding tools and Steam Workshop support shipped on day one ✅ VERIFIED (confirmed in the official launch press release). You don't wait for a community crack — you can legally mod the game from hour one. This page covers both routes: the one-click official Workshop subscription, and the manual install of the community loader Fluxloader, plus the safety and save principles every modder must know.

Route 1: Official Modding Tools & Steam Workshop

✅ VERIFIED (official press release): native modding tools shipped with the game on launch day and plug into the Steam Workshop. For most players this is the lowest-friction path:

The upside of Workshop is automatic updates and auto-mounting; the catch — see below — is that every physics update from the game can break older mods.

Route 2: The Fluxloader Community Loader (Five Steps)

Fluxloader is a community-built mod loader ✅ VERIFIED (community tool, findable via official community channels). It's for players who want community mods outside the Workshop, or finer-grained load control. Install flow:

Three Mod-Safety Principles

• Mod saves are kept separate from vanilla saves ✅ VERIFIED (official): the game isolates the two save types, so removing mods won't corrupt your clean save — but a modded save won't load cleanly in an unmodded game either.
• Physics updates break old mods ✅ VERIFIED (official): in EA, every physics-simulation update can break mods that depend on the old behavior. After a game update, disable all mods first, confirm the game is stable, then re-enable one by one to hunt conflicts.
• When something breaks, suspect mod conflicts first: a launch error like 0xc0000142 is often a mod conflict — see the 0xc0000142 troubleshooting guide.

Demo vs EA Version Note

The free Demo and the EA full game differ in mechanics like the heat system, and mod compatibility isn't identical either — a mod written for EA may not run on the Demo, and vice versa. The full list of mechanic differences is in Demo vs EA Differences.

On the Multiplayer Mod: Sandustry Together

First, a fact: Sandustry is purely single-player ✅ VERIFIED (official FAQ) — there is no official multiplayer.

A community multiplayer mod — "Sandustry Together" (requires corelib ≥ 3.1.0) — does exist. But note this info is from a single source 🔶 COMMUNITY, and its stability is not widely verified. If you want to try it: back up your save, confirm the current compatible version on the official Discord mod community, and be mentally prepared for it to break on any game update.

The Workshop is hosted inside Steam — see the game's Steam Workshop page for day-one uploaded mods.