Upvote:10
Not really. First of all, the Foreign Legion provides no visa assistance whatsoever, full stop:
La Légion Etrangère n'effectue aucune démarche en vue de l'obtention d'un visa ou autorisation de sortie du territoire des candidats à l'engagement.
So you will need to get a visa to France (or another Schengen country) on your own merits.
There are various anecdotal claims on the Internet claiming that a) stating that you want to join the Foreign Legion is automatic grounds for visa rejection, and b) the Foreign Legion accepts even applicants who are in the country illegally. I can't find any official reference either way, and both seem unlikely.