Yes you can do mba(hosp. Manag) after doing B Sc nursing.This will leeds to management side only,but if you want to go for academic side PG is a god option for you.There is great demand for english speaking trained nurse in UK,US,Canada.You can do MBA from any AICTE approved Institute in India
You will get this on AICTE site & for PGDBM university attachment is not required