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Ostia Lido is the closest beach to Rome where you can find many private beaches along the boardwalk. You can get there only for 1.50 euro using a regular city transport ticket, which is valid for 90 min. See detailed instruction here.
Don’t forget during your trip to Rome that there is a Tyrrhenian Sea (Mare Tirreno) only about 25km from the city. Within half an hour you can get to one of the beautiful beaches by train. Mostly, there are private beaches (stabilimenti) where you have to pay for the entrance. On average the price is 10-15 euro per day.
Also, many beaches around Rome have the blue flag, which is awarded for the purity of water and the coast, the presence of at least minimal amenities, as well as an adequate work of lifeguards and conveniences for people with disabilities
For more information I recommend you to read about Best beaches near Rome and about One Day Trip to Ostia Antica.