It depends on the size of your garden, but if you have an average-sized garden or limited mobility, then yes.
There are many types of carts available on the market today, but it is recommended that you buy one made from sturdy plastic or metal with wheels at least 2 inches in diameter. You want to make sure it won't wear out too quickly because then your investment will be limited to just one season.
The best carts also have handles, so they can easily be pulled along by hand or pushed ahead with each footstep while walking around with plants and soil inside them.