Not necessarily. The power supply you are using probably has enough power for your layout.
What can be more important is that you spread or distribute the power from your power supply around the track, rather than just one connection point/feed, so that your trains do not lose power or slow down at locations far away from your one central connection point.
One way you can accomplish this is to connect your power supply output to a terminal or distribution block, rather than the track, and then run multiple connections from the block to various locations around your layout.
One example of a distribution block is shown below.
You can also run what are known as "bus wires" under your layout from the power supply and then connect feeder wires from the bus wires up to the track at various locations around your layout.
