The "Dabangg" star, who is on self-imposed break on Twitter, took to the micro-blogging site to share the update with her fans.
"Just an update on Haseena, am trying to workout the dates. This film is very special to me and I'm trying my best to clear the date clash," she wrote.
In an earlier interview, the 28-year-old actress had said she is yet to sign the film.
The biopic is directed by Apoorva Lakhia of "Shootout at Lokhandwala" fame, which is expected to go on floors this year.
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If things get finalised, this won't be the first time Sonakshi will be starring in an underworld film.
She had played Dawood's love interest in "Once Upon ay Time in Mumbaai Dobaara!", which was said to be based on the life of the fugitive don.
The actress will be seen next in Abhinay Deo's "Force 2" and "Akira", directed by AR Murugadoss.