Gerry Carson, 84, from Kingsway, Dunmurry in County Antrim, appeared at Belfast Crown Court on Thursday. He denied engaging in sexual activity with a child and sexual touching of a child, and pleaded guilty to two counts of stalking.
The judge set a trial date of 30 November for the sex offence charges, with proceedings expected to last two to three days. Asked in the dock to confirm his identity, Carson replied: "Yes."
The judge told the 84-year-old that he would "remain on bail on the same terms you presently enjoy."
Carson is a former president of Athletics Northern Ireland, the governing body for the sport in the region.