Bill Kenneally, formerly of Summerville, Newtown, Waterford City had pleaded guilty to 13 sample charges at Dublin Circuit Criminal Court.
He had initially pleaded not guilty to 266 counts of indecent and sexual assault but changed his plea to guilty on the sixth day of his trial.
72-year-old Kenneally indecently assaulted five boys on multiple occasions in locations in Waterford, Cork and Kilkenny on dates between December 1979 and March 1990.
The court heard Kenneally is currently serving a 14 year sentence for sexual assaults on 10 other boys, now men, also it the 1980s. The new sentence of four and a half years is to begin after the current sentence ends.
Garda Inspector Siobhan Keating told the court that some of the victims came to the attention of Kenneally when he coached them in TF Meaghers Basketball Club and through connections with basketball coaching at De La Salle Secondary School in Waterford. At least one victim got to know Kenneally through Sunday morning football matches at a place known as Watty Park in Waterford City.
The court heard victim impact statements earlier, with one of the victims breaking down in court, saying his life had been ruined by Kenneally. Others spoke of the trauma, hurt, pain and psychological damage done to them and their families by Kenneally.
The court was told that when Gardai searched Kenneally’s house in December 2012, a VHS tape was recovered. The video showed one of his victims performing a sexual act.
The court heard Kenneally was a basketball coach who drove groups of boys home from sessions, drop them off until one was left, who would then be subjected to the assaults.
Kenneally also gave his victims money in multiples of 7s and alcohol.
The locations of the abuse included Kilfarrasy Beach, Faithlegg, the Minaun, Portlaw and Colligan Woods, various lay-bys, in his home and in his then-place of work.
In some cases he would tie a victim to a tree and perform sexual acts on them.
His victims were aged between 13 and 15 at the time and over a two year period, the Judge said a conservative estimate was that more than 200 assaults took place.
Kenneally also took photographs of his victims.
Judge Martin Nolan said the victims had been very brave, that the crimes were very serious and that Kenneally should be ashamed of himself.
