Andrew James Maddrell, who lives at an address off Ballanard Road in Douglas, pleaded guilty to an offence of indecent assault against a three-year-old child at the Court of General Gaol Delivery on Friday.
Maddrell, aged 24, used to be employed as a nursery worker at Sandcastles Kindergarten on Douglas Promendade.
Other offences in relation to separate charges towards children were withdrawn.
Mr Maddrell had previously appeared at a Court of General Gaol Delivery, on Tuesday, August 6, where he also pleaded guilty to an offence of possessing 232 indecent images of children.
The matter has been adjourned until September 23 for sentencing.
Deemster Montgomerie remanded Maddrell into custody until that date.