The film, directed by Milind Dhaimade, was premiered at recently held 60th BFI London Film Festival.
Starring Shahana Goswami, "Tu Hai Mera Sunday" chronicles the story of five middle-class amateur footballers and their everyday struggle in Mumbai.
When asked how was the response at the festival, Sobti told PTI, "Very heartening. BFI was a fantastic experience for all of us. I was pleasantly surprised to see how people from a different culture and background were actually engaging with the film."
The "Iss Pyaar Ko Kya Naam Doon" star said people from across the world had come to see the film at BFI, and that he is confident that the movie is well received here.
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"What was even more humbling is that people from across the world who have come to see the film. MAMI is home ground and a big opportunity for the film. People from different cultures saw the film in London and wanted to know more about the characters in the film.
Produced by Varun Shah, the movie also stars Rasika Dugal, Avinash Tiwari, Vishal Malhotra, and Maanvi Gagroo.
The 32-year-old actor got on board for the film after Dhaimade happened to find an interview of his, which led to a meeting.
"Milind wasn't sure about the meeting before it, but I managed to leave an impression so good, that he immediately sent me the script and never auditioned me for the role and before I knew it, we were doing workshops for the film," Sobti said.
"Playing football or being chilled out didn't make it easy to portray the character as he still comes from a different social and financial set up, has a different upbringing and different aspirations.
"You can't be yourself when you are depicting a character. What made it easier was the structured workshops and the time that the team spent with each other before the shoot started," he added.