Firefighters arrived and found the woman sitting in the partially submerged 1993 ES 300 near Lincoln Way. Rescuers waded into the water and pulled the woman out.
The middle-aged woman, whose name has not been released, used a ramp near Lincoln Way to get onto the beach and managed to drive across 350 feet of sand before coming to a stop in the surf, said fire Capt. Jeanne Seyler.
"Once you hit (the sand at) the bottom of the ramp, you have to keep moving," Seyler said. "It is really tough going. I'm amazed she got as far as she did."
The woman was taken to San Francisco General Hospital. Authorities do not know why she drove into the water or whether she was intoxicated, Seyler said.
The car is registered to a 42-year-old San Francisco woman who has a clean driving record, according to the California Department of Motor Vehicles. It is not known if the owner is the woman who drove it into the ocean.
Crews pulled the car out of the water.