A remorseless pedophile teacher who abused multiple boys over almost three decades has been described by a judge as morally and socially worthless.

Keith Athol Bates-Willie, 71, was found guilty by a jury in August of 14 charges including persistent sexual abuse of a child, indecent assault, rape and aggravated sexual assault.

The abuse occurred between the late 1970s and mid-2000s while Bates-Willie taught at Rosetta High School, Kingston High School and Rosny College in Hobart.

It took place in multiple school settings including darkrooms, during meditation sessions, stairwells, at Bates-Willie's home and in a spa, as well as on a Bass Strait ferry.

Sentencing judge Stephen Estcourt said Bates-Willie had shown no remorse and caused his victims to relive the abuse during the trial.

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