Luke Joseph Fisher, 34, punched the victim he had met days earlier in the nose, causing pain and bleeding.

He pleaded guilty to assault occasioning actual bodily harm after a brief of evidence was served and before the matter went to a hearing.

The offence carries a maximum term of five years in jail.

On the evening of January 5, Fisher had approached the victim, who was sitting in Lions Park, and asked "Where is my son, you have my son", court documents show.

The victim, who was staying in the same accommodation as Fisher, said he did not know what the accused was talking about.

As he responded, Fisher ran at him, appeared enraged and punched the man in the nose.

Later when police attended the accommodation where Fisher was staying, he approached them and said he had done the wrong thing and had assaulted the victim because he was drunk and confused.

When Fisher faced Dubbo Local Court for sentencing the defence tendered a report from Nguumambiny Indigenous Corporation manager Lynn Field and a copy of a Daily Liberal article.

It described how Fisher was involved in an anger management program run by the volunteer-run corporation that would construct an outdoor area for a Narromine business.

"I've been in a bad situation myself... I thought it would be a great opportunity to give back and set myself on the right path," he was reported as saying.

The solicitor submitted Fisher had taken steps towards his own rehabilitation, including the "fairly public admission" he made in the article, and it might encourage others to do the same.

Alcohol and marijuana had played a part in the assault but Fisher had now been substance-free for 52 days, the solicitor said.

Magistrate Andrew Eckhold said it was "quite a serious matter of violence" and that Fisher had admitted to being drunk and confused.

He said Fisher had a history in other states but this was his first matter in NSW and his first matter of violence.

"This was a random attack on someone you knew," Mr Eckhold said.

Fisher was sentenced to serve a two-year good behaviour bond and fined $200.

The magistrate warned Fisher if he breached the bond he could be re-sentenced and if he breached it by committing another matter of violence he could expect a custodial sentence.