"Nil Battey Sannata" marks the debut of "Bhoothnath Returns" director Nitesh Tiwari's wife Ashwini Iyer Tiwari and is said to be about the relationship between a mother and her daughter.
Swara had received best actress award at a film festival for her role in the movie.
The poster sees Swara (playing the role of the mother) and her teenage daughter jumping in happiness.
"On woman's day, I have the privilege of launching my behen @ReallySwara poster!," Sonam posted on Twitter.
The "Neerja" star and Swara have worked together in Aanand L Rai's "Raanjhanaa" and superstar Salman Khan-starrer "Prem Ratan Dhan Payo".
The movie is slated to release on April 22.