Sandy Island Beach State Park is a pet-friendly, two parcel state park. The southern parcel only allows leashed dogs on the grass and not down on the beach at all. The northern parcel is accessible only by boat. This portion is not considered a bathing beach and therefore allows dogs on it but they must be leashed. Dog owners are reminded to clean up any mess that is left behind. You can access the two parcels every day of the week from dawn until dusk.