How can I effectively separate tomato plants that are planted too close together?

To effectively separate tomato plants that are planted too close together, carefully dig around the base of each plant to loosen the roots. Gently lift the plants out of the soil, being careful not to damage the roots. Replant each tomato plant in a new location with enough space between them to allow for proper growth and airflow. Water the plants well after transplanting to help them establish in their new spots.