Almost any business database can be used for sports industry information. This page lists databases that specifically cover sport, but I encourage you to use other industry databases, marketing databases, and article databases for your research.
Check out the Industry & Market Research Basics Tutorial to learn how to use the general industry and market research databases. The 60-minute tutorial will give you a foundation in using library databases to conduct industry and consumer market research, which will be useful for sports industry and sports marketing projects.