We don't currently have a sandbox envirnonment open to users on the training side, however the SE team may have something they use for demos and test drives for potential customers. I'm not sure.
Along with our Instructor-led training courses we do provide hands on lab environments where users work through lab exercises in a training environment. We are also working on a solution to provide similar environment for on-demand labs to accompany our self-paced courses. That may be closer to what you are describing.
Feel free to reach out to discuss further.
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