Figure out where they are traveling from. Cut them off before they get to his land. Or set up your land to draw them away from that area.

You can go so far as to sabotage that area after you are confident that it won't affect how the deer are traveling onto your land. Put lots of human pressure on it just by walking through a bunch and the deer will use it less often, you could even buy predator scents. After he hunts a season or two without seeing anything, he will move the stand.