Scharner joined the Baggies on a Bosman from Wigan Athletic.
He told the club's website: "The style of play here is beautiful and what I was looking for was to get into a team that plays football.
"That's what I've missed over the last couple of years.
"Now it's up to me because I'm signed as a midfielder and this is my best position.
"I'm looking forward to it.
"I've signed as a central midfielder and that is why I joined West Bromwich because I want to take the chance to show everyone this is the right position for me."