Jake James Bostock, of Alfred Teare Grove, pleaded guilty to a charge of without lawful excuse assisting a child in care to stay away from his responsible person.
The 20-year-old also admitted offences of obstructing police and resisting arrest.
Magistrates also ordered him to pay £250 prosecution costs.
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Prosecutor Roger Kane told the court how, on January 15, a 15-year-old boy who was in care had been reported missing.
Police received information that he was at a flat in Tynwald Street in Douglas.
They went to the address at 4.30am and were met at the door by Bostock who refused to let them in.
Police tried to reason with him but Bostock stood behind the door barricading it.
The door was subsequently forced open and the 15-year-old boy was found inside.
Bostock was arrested but began flailing his arms around and pushed police away as they tried to handcuff him.
He was interviewed at police headquarters and said he had arrived at the flat at between 9pm and 10pm to see the female owner of the property. The boy was present at the time with another female.
Bostock admitted that he was intoxicated when he arrived and said that he drunk two further vodkas at the flat.
He said he had heard the police knocking but could not recall what was said due to having consumed alcohol.
Bostock admitted trying to stop police getting inside saying that he felt they needed a warrant.
A probation report said that Bostock was a fisherman who was currently signed off work with a broken hand but had the promise of a job once he was fit for work.
He said that he did not know the 15-year-old and regretting trying to stop police entering the flat.
The court heard that Bostock has no previous convictions.
Defence advocate Stephen Wood said that although the charges were serious, both the obstructing police charge and the assisting the child one related to holding the door shut.
Mr Wood entered a basis of plea on behalf of his client in which Bostock said he had only held the door shut for a brief period of time as the 15-year-old had asked him not to let the police in.
The advocate said: ’When police started banging at the door, the young man requested that Mr Bostock did not let the police in and he foolishly agreed to do just that.
’He flailed his arms around in an effort to prevent restraint.
’Mr Bostock is a young man who is looking to the future, not a young man who makes a habit of appearing before the court for drink-related incidents.
’This has been something of a wake-up call for him.’
Magistrates ordered Bostock to pay the fine and costs at a rate of £10 per week.