Thirty-eight-year-old Jonathan Barton was arrested on March 31 and is expected to appear at Oban Sheriff Court at a later date.
An ITV investigation into the school last year found that more than 60 women had made allegations of inappropriate behaviour.
Detective Chief Inspector Grant Macleod, of the Argyll and West Dunbartonshire Division Public Protection Unit said: 'Police Scotland treats all reports of sexual offending with the utmost seriousness and sensitivity.
'If you have, or anyone you know has been a victim of sexual abuse then please be assured that we will listen, we will investigate all reports and that support is available. You can report by calling 101 or 999 in an emergency.'
Alternatively, an anonymous report can be made through Crimestoppers on 0800 555 111.
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