Hello Santosh,
Learning SAP is great if you have interest and some prior knowledge in it. In your case I have a question that after being functional test lead for so many years and after working in Media what made you plan learning SAP?
Learning and changing career are two different things. So in my suggestion you please do not plan to change your career instantly rather than continue with your ongoing job and just start learning SAP after that think if you are developing interest or not. If you get interest both SAP BW and HANA will be good!