BJP state unit president Mangal Pandey told PTI that Hasan has been expelled from the party for six years for his anti-party activities.
He said that the disgruntled leader had slammed the BJP and its leadership in the wake of party's electoral defeat in Bihar last month.
Hasan, a former JD(U) leader, had joined the BJP early this year, but could not get a ticket for himself or his spouse in the assembly polls.
Hasan had also attacked Prime Minister Narendra Modi for his aggressive electioneering in Bihar, which he claimed, had cost the BJP-led NDA dearly at the hustings.