Per the California Coastal Act, you're free to walk along the waterline (below the high tide line). However this particular beach is surrounded by rocky cliffs

Per the California Coastal Act, you're free to walk along the waterline (below the high tide line). However this particular beach is surrounded by rocky cliffs so it's unlikely you'd get very far. Closest access would probably be via kayak from San Gregorio State Beach 3-5 miles south. Though there are lots of pullouts along that stretch of Highway 1.