I think you are talking about the Harvey Public Sound access...that is where I launched a couple weeks ago. I noticed some people leave their boats there, but I am not sure whether you need to call someone to get permission. You'll want beach wheels to launch from there since there is no ramp. Before I had wheels I launched a couple times at the ramp near the bridge across from pirates cove.

There was a hobie 18 (stored on the dune)that was launching in the ocean across from Winks (~MP2.5)...there is an emergency vehicle access right there so I assume that would be how to get your boat on the beach.