South Launceston's Terence Williams, 40, received a suspended jail sentence for the 2011 aggravated sexual assault of the 30-year-old woman. 

While treating her for a sore foot Williams removed the victim's  underpants and inserted his ungloved finger or fingers into her bottom.

During his trial last month Williams said he was checking to see if her spine was out of alignment.

A Launceston jury found him guilty in less than two hours. 

Yesterday in Launceston's Supreme Court Justice Peter Evans said he was dubious about Williams's denials that he was sexually motivated.

``What the defendant did was an appalling breach of trust and . . . it has had a devastatingly adverse impact on the complainant,'' Justice Evans said. 

But he said he could not be satisfied beyond a reasonable doubt that Williams had been motivated by sexual gratification.  

Crown prosector Virginia Jones did not oppose that finding. 

Justice Evans said Williams had destroyed his career and would inevitably be prevented from ever practising again.

He sentenced Williams, who has already spent 10 days in custody for the offence, to four months' jail wholly suspended on the condition he be of good behaviour for two years.

Justice Evans did not order Williams's name be placed on the sex offenders register.

Williams has been suspended from practising podiatry in Australia since being  charged in 2011. 

If he seeks to reregister as a podiatrist he will have to disclose his criminal record. 

It is also open to the Health Practitioners Tribunal of Tasmania to cancel Williams's registration if he is referred to it for investigation by the state medical board.    

Williams came to Tasmania in 2010 on a skilled migration visa to work as a podiatrist in Launceston. 

An immigration spokeswoman said a conviction had the potential to adversely affect visa status. 

However, any decision to cancel the visa would be up to Immigration Minister Brendan O'Connor. 

The spokeswoman would not comment on whether Williams's inability to practise podiatry affected his working visa.