In 2019, she performed in a song ''Mungda'' in comedy film Total Dhamaal. She next starred in the period romance film Kalank with an ensemble cast including Aditya Roy Kapur, Sanjay Dutt, Madhuri Dixit, Alia Bhatt and Varun Dhawan. The film failed to perform well commercially.
In 2019, Sinha was cast in drama film Mission Mangal, which featured an ensemble cast, including Akshay Kumar, Vidya Balan and Taapsee Pannu. The project began filming in 2018, and was directed by Jagan Shakti. The film was a massive commercial success at the box-office, grossing over 200 crore on a budget of 30 crore, and received positive reviews from critics. She is appearing alongside Ajay Devgn, Sanjay Dutt and Parineeti Chopra in war drama film Bhuj: The Pride of India. After that, she will reprise her role in Dabangg 3 opposite Salman Khan, which will be directed by Prabhu Deva.
On 21 September 2019, after failing to answer a question in show Kaun Banega Crorepati 11, she was promptly trolled on Twitter. During the 25th episode of KBC 11, the show’s actor-host Amitabh Bachchan asked Sonakshi, who shared the hot-seat with Rajasthani artisan Ruma Devi, the question "According to Ramayana, Hanuman fetched the Sanjeevani herb for whom?" Sonakshi failed to answer the question, which led to widespread trolling of her on the micro-blogging site Twitter. #YoSonakshiSoDumb was trending on the Twitter during the time, as well as Amitabh Bachchan also made fun of her because of lack of general knowledge. In the response, she sarcastically accepted that she doesn't have knowledge of Phythagoras Theorem, Mughal Chronological order and concluded with her love for memes in the response to trolling.