Condensation issue

RRR I noticed during the summer with my garage floor if I leave the doors open the whole floor will sweat. If I put a fan blowing across it, wherever the fan is blowing will dry but all around it is still wet.
I think the only cure is to close it up and turn on a dehumidifier.

I think the fix is to put insulation down on the ground and pour the concrete on the top of it the next time. Or a layer of plastic. I don't know the experts to tell us the fix.