Graduate / Need Help to write SOP to change Biomedical Engineering to MS in Computer Science. [3]

Hey Friends. Plz help me out , i am Completed B.E. Biomedical and Working as Sr. Software Developer now since 2 yr.
My problem is i could not able to write SOP for Changing Engg field and Apply to foreign Uni. I want to persue Ms in CS,... plz help me

Thanks in Advance