McGrath, 37, retired from cricket after winning a record third successive World Cup for Australia in the West Indies last April.
"I'm very keen to make sure that we make use of an Australian legend like Glenn McGrath who is right on our doorstep," state coach Matthew Mott said Friday.
"My forte is batting and at some stage we will be desperate to pick up some bowling expertise there.
"Whether that's the second-eleven coach or a full-time bowling coach, that's for us to work out."
Mott said he needed to find an appropriate time to speak with McGrath, Test cricket's all-time leading paceman with 563 wickets.
"He may want some time off and we've got to respect that," Mott said. "He has played international cricket for a long time and I'm sure he's keen to spend some time with his family.
"When the opportunity is right there will be an open door for him to come in and help out, depending on how much work he wants to do, as little or as much as he can give us.
"When he has come back into our set-up from the Australian team, he has been extremely helpful.
"He has got a good rapport with the players, he has got instant respect the moment he walks in the door and anything he can add, we will try to savour."
McGrath was the player of the 2007 tournament after a record-breaking haul of 26 wickets, the most at a single World Cup.
Mott replaced Trevor Bayliss, who was last week appointed to replace fellow Australian Tom Moody as Sri Lanka's head coach.