"In a high-level meeting held on Saturday morning, the party suspended primary membership of Sandeep Kumar," AAP's Delhi convenor Dilip Pandey told IANS.
A further decision on terminating him from the party will be taken later, he added.
The AAP on Wednesday night sacked former Social Welfare and Women and Child Development Minister Sandeep Kumar after a video emerged showing him in an "objectionable position" with a woman.
On Thursday, Sandeep Kumar defended himself, saying he had resigned on his own and that he had been targeted because he was a Dalit.
In a bid to rebut the charge and accusations from elsewhere, Delhi Chief Minister Arvind Kejriwal on Thursday said he was "very pained" by what Sandeep Kumar did, which led to his sacking on grounds of morality even as the dropped minister alleged a conspiracy against him because he was a Dalit.
In a video message, a pensive looking Kejriwal said he would prefer to die rather than deviate from the AAP's principles.
The Congress and Bharatiya Janata Party (BJP) slammed the AAP over the alleged sex scandal.