It’s possible, but it’s hard and not everyone can do it. Of all of us here, @LuckyGuy probably possesses the skills for success in this endeavor. And @Mariah is right, you better be young and healthy, or you could die of something as simple as an injury resulting from tripping over a root on a dirt path. As to having a job, well, your job will be to continuously scavenge, build your habitat and survive. But some places are easier to do this than others.
There are places all over the world that have fair weather, adequate water and food sources where you could spend the rest of your life in peace and tranquility. Paradise. But it is not for everybody, by any means.
Here in the Caribbean, for example, there are plenty of uninhabited islands with fresh water sources and both adequate flora and fauna to healthfully feed oneself. In the Raggedy Islands in the southernmost part of the Bahama chain, there are rich fishing waters right offshore and even swimming pigs that will steal the bait off your hook and clamor at the side of your hull for scraps. Easy pickings. There are fresh streams, abandoned goats now in feral herds, abandoned fruit orchards, and wild vegetables for the taking. As they say here: Fish from the Sea, Fruit form the Trees.
But you would be hard pressed to find human companionship other than a passing yacht or the few misanthropic hermits, mostly old men, that have lived there for decades in self-imposed exile. If you own a nice boat, have a captain’s license, a divemaster’s license, keep your boat insured, clean and your equipment in good shape, you can supplement your living by earning hard currency from the tourists on the nearby populated islands.
But one little accident, one poisonous spider or snakebite, one infectious bite from those pigs, one minor scrape with a school of barracuda, on incident with a moray eel, one shark bite, one one sickness that causes you to become immobile for two weeks, or one serous bout with the flu—all things that are easily dealt with by dialing a simple emergency number back in the real world—- anything that could keep you from fending for yourself for a week or two, could me death by thirst or starvation.