Bonevacia and Risdon have both signed on until the end of the 2018/19 A-League season, while Thwaite has put pen to paper on a one-year deal.
Bonevacia joins from Wellington Phoenix where he made 80 A-League appearances and netted 14 goals across three seasons with the club.
A youth international with the Netherlands, Bonevacia’s ability to fill a number of attacking roles for the team will be a big bonus for Wanderers boss Tony Popovic.
“I’m very excited to start a new challenge, it’s something I’m really looking forward to,” Bonevacia said.
“The club is very hungry for success and the coach gets the best of out his players and makes them better, so I can’t wait to get started.”
Risdon moves across from Perth Glory where the right-back was the club’s most capped player with 142 appearances.
The 24-year-old made his professional debut at 18 after two years with the Glory’s youth side.
Capped three times by the Socceroos, Risdon said he was delighted to be entering a new stage in his career.
“Obviously being at Perth for so long, it was a tough decision but I feel that this is the right choice and I’m really excited for the new experience,” Risdon said.
“The Wanderers are a great Club and have achieved so much in such a small time, so I’m looking forward to working under Tony Popovic and taking my game to the next level.”
Thwaite arrives after spending last season with Liaoning Whowin in the Chinese Super League.
The former Socceroo, who began his professional footballing journey in Western Sydney with Marconi Stallions, returns to the A-League for a ninth season.
The 34-year-old won a Championship with Victory in 2008/09, and was named Gold Coast’s Player of the Year in 2010/11 and Perth’s Player of the Year in 2013/14.
Capped 13 times by the Socceroos, the 190cm big man said his decision to return home was an easy one to make.
“It has a lot to do with the response from both ex-players and the current players at the Wanderers. I know that Tony’s very thorough and his success is proven so it’s something that I’m very eager to be a part of,” Thwaite said.
“Western Sydney is a very important region for me because that’s where my professional career started, so I feel that I need to give something back to the region.”