Not gonna happen, unless you're into primitivism; this is the only way you could avoid having to interact with other nations, since they have all the goodies you'd want to live a comfortable, modern life. Self-sufficiency only goes as far as you have the materials necessary to create, and no island is going to have everything.
I'm not into separatism and primitivism. My point is to have a nation where we can enjoy laws that is just and fair that is truly for the people. Not under the laws of the tyrant nations. Of course we can still export and import to other nations.