hi,

see astrophysics course is mainly available in full time study mode. however Indiara Gandhi national open university has integrated course on m.sc+ phd on physics and astrophysics are in distance learning mode, follow the link to know in details:

http://www.ignou.ac.in/ignou/aboutignou/school/soits/programmes/detail/288/1

another option is liverpool john moreers university which offer diatance or remote learning course on M.sc astrophysics. this university is quite popular bacuase of its quality lectures and curriculum. follow the link to know in details:

https://www.ljmu.ac.uk/study/courses/postgraduates/astrophysics-msc