The scout leader also operated in Fiskerton, a village near Lincoln located in West Lindsey.
John Pycock, 83, denied sexually abusing the boy in the late 1980s and early 1990s while he was a scout leader in Lincolnshire.
But a jury at Lincoln Crown Court convicted him of indecency with a child, two counts of indecent assault and two other serious sexual offences.
Pycock, who faces a third prison term, will be sentenced on Friday.
He was jailed for six years in November 2020 after admitting three charges involving sex offences against a young girl.
Pycock, formerly of Winn Street, Lincoln, was also previously jailed for 51 months in June 2014 when he admitted five sex offences against young boys.
At the time, the court heard that he invited the boys to his house and abused them while his wife was working night shifts as a nurse.
However, he had been released from that sentence by the time the 2020 offences came to light.
On Tuesday, Judge Catarina Sjolin Knight remanded him back into custody until sentencing, which will be at the same court.
Pycock, who was a scout leader in Billinghay then Fiskerton, hung his head but showed little reaction as the jury returned their guilty verdicts.
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