I'm not sure there is a way, and I would suggest that there is a different requirement than actually finding the cursor position.
If you are trying to paste some text, you can always copy the text to the test method, paste the text and write it back.
Or, if you do not need to do this, you can always use the Keyboard.SendKeys method to send the home command, and then any number of commands with arrows on the right to place the cursor where you want.
Can you tell us more about what exactly you need with the cursor position?
source share