Here are all the San Diego beaches that offer beach wheelchairs, some are motorized. The others need to be pushed by a companion. First-come, first-served. You'll need ID and you'll need to leave your wheelchair as collateral (if you use one).
San Diego County
Imperial Beach, Imperial Beach (motorized chair), (619) 685-7972
Silver Strand State Beach, Coronado, (619) 435-0126
Coronado City Beach (motorized & manual chairs), (619) 522-7346
Ocean Beach Park, San Diego, (619) 525-8247 or (619) 221-8899
Mission Beach, San Diego (motorized & manual chairs), (619) 525-8247 or (619) 980-0275
South Pacific Beach, San Diego, (619) 525-8247 or (619) 221-8899
La Jolla Shores Beach, La Jolla, (619) 525-8247 or (619) 221-8899
Torrey Pines State Beach, San Diego (at the South Beach Kiosk), (858) 755-1275
Del Mar City Beach, (858) 755-1556
San Elijo State Beach, Cardiff-by-the-Sea, (760) 753-5091
Moonlight Beach, Encinitas, (760) 633-2750
South Carlsbad State Beach, Carlsbad, (760) 438-3143
Oceanside City Beach, (760) 435-4018
Harbor Beach, Oceanside, (760) 435-4018
San Onofre State Beach, San Onofre, (949) 492-7414
San Diego County
Imperial Beach, Imperial Beach (motorized chair), (619) 685-7972
Silver Strand State Beach, Coronado, (619) 435-0126
Coronado City Beach (motorized & manual chairs), (619) 522-7346
Ocean Beach Park, San Diego, (619) 525-8247 or (619) 221-8899
Mission Beach, San Diego (motorized & manual chairs), (619) 525-8247 or (619) 980-0275
South Pacific Beach, San Diego, (619) 525-8247 or (619) 221-8899
La Jolla Shores Beach, La Jolla, (619) 525-8247 or (619) 221-8899
Torrey Pines State Beach, San Diego (at the South Beach Kiosk), (858) 755-1275
Del Mar City Beach, (858) 755-1556
San Elijo State Beach, Cardiff-by-the-Sea, (760) 753-5091
Moonlight Beach, Encinitas, (760) 633-2750
South Carlsbad State Beach, Carlsbad, (760) 438-3143
Oceanside City Beach, (760) 435-4018
Harbor Beach, Oceanside, (760) 435-4018
San Onofre State Beach, San Onofre, (949) 492-7414