Let me make the assumption that the vessel is too big to be trailered?
If the boat is trailerable then move a trailer into place, secure the trailer under the boat and have a tow truck wench the trailer and boat out keeping a sharp eye on the lower unit.
Beyond doing what George is sugggesting since I'd be concerned about sucking up sand and muck into the cooling system, you might try a winter fan that is normally used to keep docks clear of ice. Use it to 'dig' a trench into deeper water by pointing the fan into the sand, blowing the sand away and walking.
If those things failing, a friend of mine had this problem in the channel of Gov's Isle a number of years ago when the water dropped before he expected. He ended up having to leave his cruiser in the water all winter and he surrounded it with fans to keep the area free of ice. Vigilance is needed if you have to go this route.
Let us know what happens and good luck.
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