Ofcom is looking at the rules governing Sky's rivals' access to Sky Sports 1 and 2.
Sky allows other broadcasters access to the channels on a wholesale basis on the condition that the arrangement is extended to their key sports content in return.
Ofcom set prices for this wholesale access in 2010, and said it would review them in three years. The review started at the end of last year. Ofcom has now announced it is carrying out more consultation.
BT has said Sky's stance is "anti-competitive". Sky says its position creates a level playing field, with all providers having access to key sports content.
This follows BT's request that Ofcom investigate Sky's dominance of the pay TV market.
John Petter, CEO of BT's consumer division, claimed Sky's dominance has led to high prices and poor deals for consumers.
He asked Ofcom to expand the scope of its digital communications review.