Bandh won the Pulwama assembly seat for the PDP in the 2002, 2008 and 2014 assembly elections.
In a letter addressed to the PDP president, Bandh said he was feeling suffocated because his advice as a senior leader was always ignored after the death of Mufti Muhammad Sayeed who had painstakingly created the party.
The PDP has been facing a political upheaval since the PDP-BJP ruling coalition headed by Mehbooba Mufti collapsed last June.
Top leaders of the party including Imran Ansari, Altaf Bukhari, Basharat Bukhari, Javaid Mustafa Mir and some former MLAs have already deserted the party.
Mufti who contested the Lok Sabha elections 2019 from the Anantnag constituency lost to Justice (retd.) Hasnain Masoodi of the National Conference.