Indian media reported that Gurmeet Ram Rahim Singh's followers set a vehicle alight just ahead of sentencing.
Violence after Friday's verdict in Panchkula in northern Haryana state had killed some 38 people.
The self-styled holy man was found guilty of sexually assaulting two female followers and jailed for 10 years for each, to run consecutively.
There were initial reports of a 10-year sentence but his lawyers confirmed the sentencing was of consecutive, not concurrent, terms.
Prosecutors had called for a life sentence.
