Lots

But very few sailors on the EP now. The one's that are left are mainly wave sailors although PK in Port Lincoln is on the SA Speed Demons GPS Team, he may see this post and advise some spots. (You could also contact Peter Ross at OES Australia )
Depending on your time frame, suggest you go on Google Earth and check out some of the bays as you work your way along the coast.
On the Western side of the Peninsula have a look at Smokey Bay, Streaky Bay, Port Kenny/Venus Bay ( haven't sailed these ) but used to sail Coffin Bay area.( Long Beach / Kellidie Bay/ Little Douglas/ Dutton Bay ). It will depend on the wind direction as to where you can sail.
On the Eastern side you need South Easterly winds. Apart from North Shields in Port Lincoln didn't sail any other spots. Always wanted to try Ski Beach at Tumby Bay and Lipson Cove on a South Easter and the southern end of Franklin Harbour at Cowell but never got round to it.
You can also sail at Whyalla ( mainly kiters now).
Enjoy your adventure.