Next time you catch him on your property, take him(may have to use some persuasion) to a secluded portion and have him start digging a hole. Tell him he had ample opportunity to mind his own business, but chose to invade your privacy. After he pisses himself, allow him to leave with the understanding that he never again sets a foot on your property, or anything you think is yours.
Credit given to a scene from Yellowstone for the idea.
Or if not bear traps can’t you use a razor wire fence?