The former Great Britain and Leeds star had been working in a part-time coaching role at the club since the beginning of last season.
He will now be much more involved in team affairs, and will take a more active role in the day-to-day running of the club, particularly the work done by the Include Foundation.
“Keith will be continuing to coach with me, and will also work with the foundation as a motivator going into schools and other public appearances,” said Eagles chief Mark Aston.
“It will be good for Keith to go into schools and tell them about how it all started for him at the Eagles to become one of the greatest centres in Great Britain’s history. It proves it can happen.
“He will also be going out to meet companies who could potentially come in and buy into the long term vision of Sheffield Eagles and rugby league in South Yorkshire.”