Pangea map with isolated start for human player

I want to play map where the human player has got an isolated start (i.e. separated by ocean) but all the AI civs start on one continent, and those two land masses are basically the main landmasses.

I don't mind if it's pre-generated or random, as long as I can choose my civ and also the AI civs.

I'm basically trying to make a map where even hard difficulty levels it's easy to avoid getting destroyed but hard to take over other civs and defend those gains. Perhaps there's another approach?

Use the world builder

Which you install by going to tools in steam and selecting "Sid Meier's Civ5 SDK". I'm new to World Builder myself but to make sure you always spawn in the same location only have 1 plot selected as 'Random player'.