EIGHT men have now been charged over attempts to perform an exorcism on a teenager at a church youth camp in South Australia's Barossa Valley.

All have been charged with assault and false imprisonment.

The charges relate to an attempt to perform an exorcism on a 15-year-old boy at a camp run by the Lutheran Church in April last year.

The eight men have been ordered to appear before the court again in February.

In the Adelaide Magistrates Court on Friday eight men were listed on a new charge sheet that includes serving police officer Roger Kenneth Sketchley.

Sketchley was suspended from duties as a senior constable when he was arrested last year.

The 28-year-old has been charged with false imprisonment and aggravated assault over the alleged incident which occurred on April 18 at a Lutheran youth camp at Tanunda.

Police will allege he tried to perform the ritual after a 15-year-old boy complained of stomach pains.

The alleged incident took place over 12 hours and police say the teenager was restrained by other adults.