Practice slowly, many times, and focus on the follow-through--and end with your tip on the table. If the stroke is down-angle, it can almost happen automatically, but if stroking more level, you follow-through above the table, then let the cue tip down to the table, then reset however you want. The latter form may feel a little weird, but it shouldn't take long to acclimate.
This can also aid in training to stay down on the shot, as you're not done with the stroke until you have completed the tip-to-table contact--maybe even give it a 1-count while there.