Uh, no.
Most of the land in the world is spoken for, and the countries owning this or that acreage are not going to let anyone set up a new country on it. Hell, hippies couldn’t even set up a country on the Thames Estuary forts (Sealandia).
http://www.bbc.com/travel/story/20200706-sealand-a-peculiar-nation-off-englands-coast
It would be NICE if there were some place we could exile violent malcontents and allow them to build in a nation of their own, though.
Give them Sinai. Build it according to their green new deal specifications. Then see how long their society lasts. Make it an international city and move the UN there.