There are many places where you can find maps of Christopher Columbus' voyages.

To find maps, information, and plenty more on Columbus and his four voyages, a simple Internet search should lead you to plenty of websites with all the resources you'll need. You can also, of course, visit a library and check out an encyclopedia or book on Columbus for another likely source of maps as well as explanations of his various trips, routes, and the results of each one.
Below are just three examples of websites to give you an idea of what you might find during your search for a map of Columbus' voyages. Each of these sites, like many others available, offers various maps of Columbus' voyages that should give you a starting point as well as an idea of what is available.
The Garden of Praise site offers free educational materials for students of various ages, and has maps of each of the four voyages of Christopher Columbus separately:
The U-S History.com site features a great write-up about Columbus, and a map with colored arrows showing all four main voyages on one image:
A marvelous resource for anyone interested in the voyages of Columbus, the Columbus Navigation site features highly detailed explanations of each voyage and separate maps plotting the points of every one:
When you are looking for a map of the voyages of Christopher Columbus, it helps if you know exactly what kind of map you are looking for.
Columbus' voyages can be traced easily via map, and there are plenty of resources online that you can use to find such maps. Whether you need it for research, personal interest, or homeschooling purposes, finding a map of Columbus' journeys is simple.
Keep in mind however, that during the time frame between 1492 and 1503, Columbus took a total of four round-trip voyages, from Spain to America and back again. Each used a slightly different route, and each took place over a different time span, with its own particular place in Columbus' history.
It's entirely up to you how you decide to do your research. You can choose to search for separate maps of each voyage, or you can find a single map showing all of his trips at once.
Having all four voyages on one map has the added bonus of allowing you to compare them and see the different routes he took and how they match up (or don't) with one another.