Obtain SAP Training & Certification. Choose an SAP module and get a certification from an authorized SAP training partner. SAP training is expensive but it’s worth the investment.
Join a consulting company If you have good business/domain knowledge (and want to learn SAP?), you could consider joining an IT consultancy company like IBM, Deloitte, Infosys etc as a junior consultant.
Join as a Trainee or in SAP support You can consider joining a company that has SAP implemented and work as a Trainee or support personnel. The company may later sponsor your SAP certification and training. The trick here is to find such a company and convince them to hire you.
Join SAP Project as a non-SAP person. Many SAP projects require skills outside of SAP. For instance, lots of projects require a data conversion individual. If you are good in database and SQL, you might consider joining the project and later teach yourself SAP.