The move has been made so that the club can play home games and train regularly on their home turf.
They played for four years in Neath before a temporary move to Maesteg this year, where one game will be played in 2015 to continue the link.
Other on the road matches will be played at Cardiff Arms Park and Stebonheath Park in Llanelli.
Wales Rugby League’s chief operating officer, Chris Thair, said: “The move to Mountain Ash is a good fit for everyone and when the idea was being discussed, it has certainly generated a lot of excitement amongst the players and staff.
“Having signed up many of the squad and staff for next season we can move there with a lot of confidence that 2015 will be another step forward for the Scorpions.
The Scorpions held one match at Mountain Ash RFC last season and the Wales v England under 16 international was held there the week before, with almost 1,000 people collectively passing through the gates for these two games.
Scorpions coach Mike Grady added: “I’m really pleased and excited about the move to Mountain Ash. It’s massive for us as a club to have the playing and training base all at the same venue for the first time, and also somewhere to build relationships in the community going forward.
“The Hunslet game was a great success for me as was the under 16 international the week before. Everyone bought into the Rugby League, the community, Mountain Ash RFC and also the players. It was the second highest crowd of the season and a great day all round.
“It’s on the doorstep to majority of the coaching and off field staff and for many of the squad, which means we will be getting into the local community and more importantly the local schools to make people aware of the Scorpions brand.”
Parc Dyffryn Pennar is the home of Mountain Ash RFC.