Osmania university Hyderabad and Acharya Nagarjuna university Hyderabad offer distance education program in Msc Statistics. The courses are highly reputed. But the issue is that assignments and even Exams are to be given at their study centres which are located in Telangana and Andhra Pradesh states only. So its not truly distance education. Incase you are able to appear in their study centres, its still a good option.
IGNOU has another program PGDAST. Its a one year program. But its not equal to MSC. Ignou also has MACS program which is a combination of Maths, Statistics and Computer science. It is equivalent to Msc as its of 2 years duration. Check the syllabus in its prospectus and then decide.