No. There is a size about ten to a hundred times smaller than the sun that planets cannot be bigger than and still be planets. A planet larger than that becomes a star. The sun itself would be a planet if it weren't too big, but because it is too big, it is a star.

There are many, many, many stars that are bigger than the sun. In fact, most of the stars that you can see at night are bigger than the sun. There are many more stars yet that are smaller than the sun, but they are too faint for your human eyes to see without a telescope. We can only see the sun because it is so close to Earth.