The proceeds of the sale will be reinvested in JJB's store refurbishment programme.
JJB will retain ownership of the leasehold sites and will continue to trade from the retail stores and healthclubs which are attached to the Soccer Domes.
JJB has also entered into a five year sponsorship agreement with Powerleague. The sponsorship deal will give JJB access to more than 120,000 grassroots footballers who play the game on a weekly basis.
JJB chief executive, Chris Ronnie said: "The sales of our Soccer Domes business to Powerleague is representative of our strategy of focusing on re-energising our retail offering whilst at the same time looking for opportunities to increase the number, and profitability, of our combined health clubs and retail stores."
Ronnie added: "I have every confidence that Powerleague, the premier operator of 5-a-side football in the UK, will successfully integrate the Soccer Domes into its own business. Many joint opportunities exist for both companies to work together and we look forward to developing these with Powerleague's management."