Weerawansa made an impassioned speech in parliament saying he had learnt that he would be removed from the party after upcoming provincial council elections in the East of the island.
Nine JVP lawmakers said they disagreed with a party decision to oust Weerawansa and said they would work as an independent group in parliament.
"We will work with him [Weerawansa], but we will continue to be in the JVP as an independent group," lawmaker Weera Kumara Dissanayake told reporters at a hastily called media conference.
"We condemn the moves to oust comrade Weerawansa."
The JVP has 38 members in parliament with one member, Nandana Gunathilake, already supporting Sri Lanka's ruling coalition independent of the party line.
In a dramatic move, Ranaweera