Largo Sermoneta. At the end of via Posillipo, where starts via Mergellina, there is the free beach which is located at Largo Sermoneta. It is not very convenient because in the vicinity there are a boat and many rocks.
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As in every part of Italy, don't expect many beaches to be free. The only free beach in Sorrento Marina Piccola is a small strip between Peter's beach club and Marameo beach. It is small and it gets very busy during the summer months.
The Free Beach at Marina GrandeMarina Grande's free beach is next to the ticket office for the high speed ferry to the mainland. Though the beach is near the port, the water is always clean. Though the beach is lovely, it tends to get very crowded in high season!