Yes, but with a caveat - it has to be sustained lap swimming with a minimum target of 30 minutes. You get a full body workout, but you need to build up to where you can go at it solidly - which is where the fitness can really improve.
Swimming is an excellent way to improve your fitness. It is much easier on your joints than running but is similar in its solitary style. It also improves the strength of your muscles and your coordination.It also incorporates your upper body and core muscles much more than running so it is a more balanced workout.
The biggest benefit though is the aerobic/cardiovascular benefit. The controlled breathing that swimming demands improves your body's ability to use oxygen which is the number one reflection of a person's fitness. If you can already swim, it is a great idea to take advantage of this great exercise to not only improve your fitness, but your strength and endurance when it comes to running.
Swimming is a great way to improve your fitness! It's actually the ideal workout, because it gives you cardio and fairly good strength training all at the same time--in fact, swimming is one of the only sports that works most of the muscles in your body at once (assuming you are doing it properly). It is also very low-impact, so it's easy on your joints.
If you want to up the difficulty or do something more interesting than just laps, try adding a few sprint, kick, or pull sets to your workout. That will give you a way to intensify your cardio work or to focus on a certain area of your body if you would like to.
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