Couple of accelleration drills from my coach, similar to what Terry has provided from Baker, you can do them on the trainer or on the road:

Ride for 1 min at a comfortable cadence at an easy pace. Easy
Back off gear 1 cog at same intensity and ride for 1-2 min,
then back off another cog, keep downshifting until you
bounce. Repeat this twice during the workout.

Ride for 1 min at a comfortable cadence at an easy pace. . Easy
Back off gear 1 cog at same intensity and ride for 1-2 min,
then back off another cog, keep downshifting until you
bounce. Repeat this twice during the workout.

If you're seated it's really not a sprint per se, more like answering an attack or bridging a short gap. True sprints are off the saddle.

From the two pros I've worked with, they both start their sprint at their usual cadence, then ramp up to around 120-130 RPM, shifting one gear as they spin out of the point where they are making effective power.

We go out and do this in the morning or at lunch after a warm up, rolling off from 20 MPH or so, concentrating on form (loose upper body, breathing, smooth shifts just before the top of the pedal stroke).

The bounce either means you're tapped out or are pedalling a bit in squares.

Definitely worth working on, the improvements I made from practice paid off with three sprint wins at roadraces for me last year, and one narrow miss.