It is possible to camp in Hainan both on the beach and in the countryside.
I haven't seen any campsites, but from my personal experience it is possible to camp pretty much where ever you like. It is certainly possible to camp outside of the tourist areas. Most of Hainan, outside of Haikou & Sanya, is undeveloped and rural. So it is not too difficult to find an empty (apart from a few local fishermen) beach or attractive countryside to camp at.
It is possible to rent or buy tents here if you don't already have one.
The Hainan Travel blog section of this website contains some experiences i’ve had camping in Hainan.
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