Hi Jung,
I use to live in Paraburdoo and went over to Dampier to Kite, the most popular beach is the one near the yatch club as mentioned above, its basically the last beach you can get to and I also found out the hard way it's also a nudist beach, seen some good and bad sites

Wickam seems to have potetial as well, the beach at the yatch club there looked pretty good, th day I was there the wind barley reached 10knots but it looked like a good spot for sure