You can sponsor an adult sister under the PNP in Manitoba and possibly still in Saskatchewan although I think you also need a job offer there now. You would have to have lived in the province for at least a year and you and your sister would both have to meet some requirements in order to qualify.
Other than that, there is the one other relative clause under the federal program that most people look at. However, you may not be married or have children and you can not have any other close relatives in Canada or other relatives elsewhere that you could potentially sponsor such as your parents.