Sakshi essays the role of Aamir's wife in the wrestling drama, which is slated to release on December 23.
The 51-year-old star says the film's director Nitesh Tiwari was impressed with Sakshi's test following which she became a part of the project.
"My mother watches television serials and she loves Sakshi. I told Nitesh (Tiwari) to try her (Sakshi for the role of my wife in 'Dangal'). Nitesh liked the test and that's how she came on board. She is fantastic and unbelievable. She gives the best shot in just one take," Aamir told reporters here.
Sakshi has become a household name with her performances in daily soaps like "Kahani Ghar Ghar Ki", "Bade Aache Lagte Hai".
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The film features Fatima Shaikh as Geeta Phogat, Sanya Malhotra as Babita Kumari, daughters of wrestler Mahavir Singh Phogat, essayed by Aamir.
Zaira Wasim and Suhani Bhatnagar will play younger versions of the daughters.
"They learnt wrestling and even get the dialect right. They pushed their limits. Suhani is little darling (and) we all love her. Zaira is very talented young girl. Sania is my favourite (and) my heart goes out to her. I connect more with her emotionally and Fatima is very talented. All four are talented," he said.
"Ira is interested in sports and painting. Both Reena and I and also Kiran encourage our kids to do what makes them happy and learn about things they are interested in," he adds.