Yes! You can move planned workouts from one track to another track. Note, changing the track removes the workout from the existing track and adds it to a new track.
If, instead, you want to keep the workout on the original track, but create a variant (or duplicate) for a different track, see Can I use a programmed workout as a template...? and Can I program the exact same workout again?
Follow the steps below for more details.
Step 1
Click on a planned workout from the calendar view
Step 2
Select "Edit" from the menu that appears
Step 3
Click into the Track menu from the Saved Workout screen
Step 4
From the menu that appears, select the new track you'd like to move the workout to
Step 5
Click the "Update Workout" button
When finished, the workout should appear on your calendar in the colors of the new track.