How to Add Mods to Your Space Engineers Server
You can add Steam Workshop mods to your server to add blocks, vehicles, gameplay mechanics and more. Mods are added by their Workshop ID in your world's config file — the server downloads them automatically from the Steam Workshop on startup. You do not need to upload any mod files manually.
Caution
Stop your server before editing the config file. A running server can overwrite your changes when it saves or stops.
Find the Workshop ID
Open the mod in the Steam Workshop
Open the Steam Workshop for Space Engineers and go to the mod you want.Copy the ID from the URL
The Workshop ID is the number at the end of the URL after?id=:https://steamcommunity.com/sharedfiles/filedetails/?id=123456789https://steamcommunity.com/sharedfiles/filedetails/?id=123456789The ID here is
123456789.
Add the mods
Stop the server
Stop your server via the dashboard.Connect via SFTP
Connect to your server via SFTP, or use the file browser in the dashboard.Open the config file
In your world folderSaves/World/open the fileSandbox_config.sbc.Insert the mod list
Look for the<Mods>block (on a new world it reads<Mods />) and add one<ModItem>per mod. Replace123456789with the respective Workshop ID:xml<Mods> <ModItem FriendlyName="Mod Name"> <Name>123456789.sbm</Name> <PublishedFileId>123456789</PublishedFileId> <PublishedServiceName>Steam</PublishedServiceName> </ModItem> </Mods><Mods> <ModItem FriendlyName="Mod Name"> <Name>123456789.sbm</Name> <PublishedFileId>123456789</PublishedFileId> <PublishedServiceName>Steam</PublishedServiceName> </ModItem> </Mods><Name>is the Workshop ID with the.sbmextension.<PublishedFileId>is the bare Workshop ID without an extension.FriendlyNameis optional and is only a display name.
Start the server
Save the file and start your server. On startup the server downloads the mods automatically from the Steam Workshop — you can watch the progress in the server console.
Mind the order
The order determines priority: mods higher in the list override mods further down when both change the same definition. Order overlapping mods accordingly.
Experimental mode & scripts
Many mods require experimental mode to be enabled — mods with their own code (script mods) require it without exception. Enable it whenever you use Workshop mods.
Scripts for Programmable Blocks are not mods and are not added to the mod list — see Allow In-Game Scripts.
Mods missing after a restart?
With the server stopped, open Saves/World/Sandbox_config.sbc again and check that your <Mods> block is still present. If not, re-add the mods and restart the server.
Important
Players do not need to download anything manually — the client loads the server mods automatically when joining. However, Steam Workshop mods require crossplay to be disabled.