Maine Sea Grant Updates Report on Public Beach Rights
Maine has a unique set of rules and traditions that govern beach access. This report from the University of Maine explains how and when the public has the right to access private beaches.
To summarize: The dry sand is almost always PRIVATE PROPERTY. The wet sand is presumed to be be PRIVATE PROPERTY (under the Colonial Ordinance) subject only to the Public's rights to "fish, fowl and navigate". General recreation is NOT one of the Public rights in the Intertidal Zone.
In other words, most beaches in Maine are private property, just like your yard.
Produced by the Marine Law Institute, University of Maine School of Law; Maine Sea Grant College Program; and University of Maine Cooperative Extension