Goyim who keep the 7 Mitzvos b’nei Noach have a portion in Olam Haba. I don’t know if that is the same as Gan Eden.
The only true reward is being close to Hashem. So presumably anyone who goes to Olam Haba gets to be close to Hashem. I would think that being close to Hashem = learning Torah and that would mean that goyim learn Torah too, but I don’t know. After all, goyim also have a mark above their lips, so maybe they also learned Torah before they were born. They do have a Neshama after all.