Last year, Ms Eastgate was charged with perverting the course of justice in relation to allegations that she coached an 11-year-old girl to lie to police and community services about the sexual abuse she suffered at the hands of her Scientologist stepfather.
The allegations were raised publicly for the first time on Lateline in 2010.
Today, she was charged with another offence relating to perverting the course of justice.
Ms Eastgate is the international president of the Citizens Commission on Human Rights, an organisation founded by the Church of Scientology. She was awarded the Church's Freedom Medal for promoting human rights in 1988.
Jan Eastgate is due to appear at a committal hearing at Sydney's Downing Centre on May 15. She has yet to enter a plea