Do international flights land at Haneda? It was my understanding it is only a domestic airport.
American contestants who want to be on Sasuke seem to go through G4-TV. Unless you are established in Japan, I am not sure they will just take you off the street (that would be kind of unfair to those that tried out and failed, it seems like to me...though you are paying your own way there).
http://midoriyama.forumcircle.com/index.php
This might help.