I realised that a designer has usually hard times getting into the video game industry without any previous experience on that. Sometimes having this previous experience is hard (developing a cool video game independently might requires more time that most of the people have available). Therefore I was wondering if there is any certification program (even paid) that someone could do in order to get sort of "certified video game designer". Any ideas?
Portfolio is always more valuable than certification, but plenty of trade schools will provide training in these areas, and will come with a certification of some sort.
Full Sail University is one of the bigger players here.