The 22-year old Republic of Ireland international took out the Toffees' Young Player of the Year last term with most of his consistent performances coming on the right side of midfield.
But Moyes feels that Coleman is a full-back and will deploy him in that position to give the team the most benefit.
"We have still got to see whether he can cope as a full-back in the Premier League, what we can say is that he can play as a winger if we need him," Moyes told the club's official website.
"There will be a little bit of a change over next season as we will look to move him a bit further back and maybe he can develop into a right-back."
Moyes added that he would like to see the former Sligo Rovers youngster become even more consistent at the top level.
"As I have said, sometimes there are things about Seamus when you can see why he was a £60,000 player and then there are other times you will look at him and say that is great business," he added.
"Overall, his progress for us - from his loan move to Blackpool to coming back to us - you can see the strides he has made.
"He really has stepped up massive levels in a short space of time and we are hoping for him to keep that going over the coming seasons."