In a letter to the UK Government, MSP Mike Russell said ministers had halted work on the plans as a result of the pandemic.
Angus MacNeil said if "all legal referendum avenues are blocked" then the party "must be able to use the ballot box" to win a mandate.
Constitutional relations secretary Mike Russell will take part in talks with UK Government ministers and counterparts from the Welsh administration.
The Ross, Skye and Lochaber MP has been unanimously re-appointed at the parliamentary party's AGM.
The SNP Westminster leader said the general election 'reaffirmed the mandate' for a referendum.
She warned Boris Johnson: 'Scotland cannot be imprisoned in the Union against its will.'
Nicola Sturgeon has told the PM he can't 'bludgeon' Scotland into seeing the world the way he does.
The words were sprawled across the exterior of Aileen Campbell's office and a window was damaged.