In Sydney, beach camping is quite limited due to environmental and safety regulations. However, there are a few beach camping options in the surrounding areas. One popular option is the The Basin Campground in Ku-ring-gai Chase National Park, which offers a beautiful beachside camping experience. Keep in mind that you'll need to take a ferry or private watercraft to reach this location.
Another option is the Bonnie Vale Campground in Royal National Park, located near Bundeena. While not directly on the beach, it's just a short walk away from the sandy shores.
For more beach camping options near Sydney, consider exploring campgrounds along the Central Coast or the South Coast of New South Wales.