"We cannot allow you to intervene in the pending case at this stage," a bench comprising Chief Justice J S Khehar and Justice D Y Chandrachud said.
The former inmate had moved the court seeking its nod to be made a party and alleged that the girls and women were being sexually assaulted in recent times as well.
The court is hearing the petition filed by another former inmate, who has sought a judicial probe into the ashram's affairs.
They challenged their expulsion upto the apex court, which in 2014 ruled that they be evicted.
Disclaimer: No Business Standard Journalist was involved in creation of this content