Direction générale de l'aviation civile - Ministère de l'Écologie, du Développement durable, des Transports et du Logement - Service-public.fr
when you get the reception ask for "recrutement exterieurs " but it may prove difficult if you do not speak french fluently.
Good luck .
For info, unless the law changed recently, they are possiblities but not for ICNA ( ATCO)