You will have to move all the other objects around the actor you want to follow.
If the actor should move left:
List objects = getWorld().getObjects(Actor.class);
objects.remove(this);
for (Actor object : objects) {
object.setLocation(object.getX()+1, object.getY());
}
Something like this should work. Remember to remove ui elements from the objects list.
There are several scenarios that people have made that follows the main actor, or moves the screen based off the player's movement. The two I've used include: danpost's Scrolling SuperWorld and SPower's Scrolling world
Hoped that helped!