The 36-year-old actress, who works as a volunteer for Casa Hogar Sion orphanage in Tijuana, Mexico, told Aspen Peak magazine that she would like to adopt a child and have kids of her own soon.
"Absolutely my biological clock is running. I will adopt, and I definitely want to have my own children," she said.
The Yes Man star added that she is currently busy keeping fit with help from celebrity trainer Tracy Anderson.
Sims is also working on a number of upcoming films, including indie drama Hickory Nation.