Following of the release of
De Dana Dan in December 2009,
Priyadarshan announced that he was working on the script of a film on
AIDS with
Aamir Khan in the lead role. The pair regularly discussed the script and Khan had agreed to fund the project, with Priyadarshan revealing he was still scripting the film in February 2011. However, the director took longer than expected to complete the script and, by May 2012, Khan and Priyadarshan chose to shelve the project. The director considered bringing in
Akshay Kumar to reprise the lead role instead, but the project failed to materialise. In July 2015, Priyadarshan announced that he would instead make the film in Tamil with
Prakash Raj and
Sriya Reddy .
Santosh Sivan was chosen as the film's cinematographer, with
Beena Paul and
Sabu Cyril as editor and art director respectively. He also revealed that the film would be produced by his former associate
A. L. Vijay's Think Big Studios and that it would be made at a cost of 20 million rupees, with the cast and crew getting a salary but not at their market rate.
Prabhu Deva later announced that he would co-produce the film with
Amala Paul, who was assigned as the film's main production representative by Think Big Studios. Vijay also suggested that
Nassar and
Ashok Selvan could be cast in the film, and Priyadarshan took them on.
Sameer Thahir later replaced Sivan, a few days before the start of filming. The team began filming without an assigned music composer and later signed
Ilaiyaraaja to work on the film's background score. The film had no songs, a notable rarity for Tamil cinema. The team shot portions in August 2015, with Prakash Raj revealing that the film had been titled
Sila Nerangalil. The film was shot in 18 days with the artists recording their voices on location by sound recording engineer Prince Anselm. After production was completed, Amala Paul announced that the film had been retitled
Sila Samayangalil. For international audiences, the film was titled
Sometimes. == Reception ==