From what I can see in the Soundcloud API - it looks like you’re unfortunately out of luck. The API endpoint that lists a user’s tracks (see: SoundCloud Public API Specification) doesn’t have any way to sort the outputs (so it always returns them in chronological order) and the endpoint that lists all tracks (see: SoundCloud Public API Specification) doesn’t have any way to filter for a specific user’s tacks.
I would maybe try and contact SoundCloud to see if they have a solution for this.