Really not a ton of time to properly recover & build back up. I wouldn't get too carried away, as you're just gonna risk injury. I take it the sprint is 4 weeks post IM. The first week can be completely off or a handful of easy training activities. Week 2 should be maybe 50-60% of IM training volume. 1 light workout per discipline is fine. I would start that towards the end of week 2. Week 3 can be 80% of IM training volume. 1-2 normal workouts per discipline. Have the intensity mirror the sprint distance. The last week is race week so a normal taper type week, mimicking the 50-60% week. Workouts should be easy. Threshold stuff is fine the week of the race. You're really looking at a 10 day block from 2.5 weeks to 1 week to go.
I wouldn't recommend trying to cram in a bunch of speed stuff right after an IM. If you can find another sprint or olympic 4-8 weeks after that race then that would be a better race to expect a good result at. Gives you time to recover and time to make training adaptations.
At this point, fitness isn't going to change much before your sprint. Your body probably hasn't been asked to do a ton of speed stuff in the IM build. I would consider those things, set realistic goals, and plan races out to give yourself a good shot at doing what you want to do when it comes to racing.
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