I haven't heard of any other than the Sri Lanka Department of Wildlife Conservation. They are doing a good job but There are many elephants in other places who are very vulnerable. Once you said this it gave me a urge that we must do something. I am going to Sri Lanka next year 2017 January. I will make sure to visit some of the places where conflicts happens between farmers and elephants. Also I will make sure to put some pictures If I could.

You can get some info here if you are interested.

https://en.wikipedia.org/wiki/Pinnawala_Elephant_Orphanage