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Reason: If you go to the game files > garrysmod > maps. If there's no gm_construct, gm_construct.nav, gm_flatgrass, and gm_flatgrass.nav then that is the reason sandbox doesn't exist.
Another simple solution: Install maps from the workshop
Reason: if the maps DO exist then that means they are either corrupted or have missing codes to work properly. Install other maps (maybe even a clone of gm_construct and flatgrass) to force the system to load the map you installed and possibly load gm_construct and flat grass.
if nothing work I suggest contacting support. If they didn't fix it, then go to multiple forums discussing your problem or create a thread of your own. Reddit is good for that.
Btw I am just an underweight 13 year old Arab, I am no expert. so if someone tells you to edit the game files with no instructions and don't know what you are doing, I suggest not doing it.