Yes the MS is a good option after b.pharm, and if this course is done from the abroad it will be very beneficial for you. For admission in the abroad you need to appear in one of following entrance examination:

TOFEL
IELTS
GRE

You can apply for one of following courses;

M.S. (Pharm.) Pharmaceutical Analysis

M.S. (Pharm.) Pharmacology & Toxicology

M.S.(Pharm.) Pharmaceutics

M.S. (Pharm.) Pharmacoinformatics

This is the list of some top pharmacy colleges in abroad:

University of Brighton School of Pharmacy and Biomolecular Sciences

Industrial Pharmaceutical Sciences MSc
University of Bedfordshire Division of Science

University of Westminster Faculty of Science and Technology

MSc Applied Microbiology and Biotechnology
University of Glasgow College of Medical, Veterinary & Life Sciences

London School of Hygiene and Tropical Medicine Faculty of Infectious and Tropical Diseases

University of Bradford School of Life Sciences

King’s College London Biomedical Sciences and Medicine

University College Cork College of Science, Engineering and Food Science

MSc in Molecular Cell Biology with Bioinnovation
University of Glasgow College of Medical, Veterinary & Life Sciences

De Montfort University Faculty of Health & Life Sciences

Newcastle University School of Chemistry

University of Salford School of Environment and Life Sciences

University of Sunderland Faculty of Applied Sciences

Pharmaceutical Sciences for OSPAP
Cardiff University Cardiff School of Medicine

University of Leicester Department of Infection, Immunity & Inflammation

University of Strathclyde Strathclyde Institute for Pharmacy & Biomedical Sciences

Trinity College Dublin School of Pharmacy and Pharmaceutical Sciences

Pharmaceutical Analysis (M.Sc./P.Grad.Dip)
University of Hertfordshire School of Pharmacy

University of Westminster Faculty of Science and Technology

Manchester Metropolitan University Faculty of Science & Engineering

National University of Ireland, Galway School of Natural Sciences

University of Brighton School of Pharmacy and Biomolecular Sciences

University of Hull Department of Biological Sciences

MSc Biomedical Science
University of Westminster Faculty of Science and Technology

MSc Haematology/MSc Haematology (Transfusion Science)

Kingston University Faculty of Science, Engineering and Computing

Aberdeen University Graduate School - College of Life Sciences & Medicine

University College Cork College of Science, Engineering and Food Science

Anglia Ruskin University Faculty of Science & Technology