Stir cheese and yogurt in a small bowl until smooth. Stir in lemon juice and herbs. Season with salt and pepper; stir. Cheese spread can be refrigerated in an airtight container up to 1 week.
Spread one side of each bread slice with cheese spread, dividing evenly. Divide sprouts, turkey, and tomato among 2 slices. Season with pepper. Top with remaining slices. Cut in half; serve.