Try a sign
You shouldn't have to do this, but next year, try a sign. Most (there are still some bad apples) sledders will honor the standard "no snowmobiling" sign. In contrast, many snowmobilers will go where there are already trails. So, if a dozen or more sleds have been through your property, and there is no signs saying "please don't", then its likely others will follow. Snowmobilers are having the same problem as those that want to raft on the lake. Too much growth, and too many restrictions coming with the growth. Snowmobiling is all but dead once you get off the lake, but it will take another 10 years for the sledders (and their business to the area) go away for good.
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