P-15 Termit, it is. RFI for 15 MMCB has been issued recently. I see a nevala!!!
And why would GoI give you a missile of $ 2.7 million US per unit cost (as per open sources) when it has ample options at lower costs (eg KH-35UE at $ 500000 US as per open sources) seeing the immediate threats in that area .... you have P-8I with Harpoon Block 2 running around there just to name one efficient platform.
One can argue the suitability of even Nirbhay in the role, of K-4 also. They are also capable enough, but you seriously need to think why would anyone in their right mind place a cruise missile with higher unit costs for this specific role in Andamans? And where is your amphibious attack coming from in Andamans? Coco Islands?
For arguments sake one can carry on .... as of today ..... there are no Brahmos there for deployment! The missiles which were tested were airlifted by strategic lifters and taken there ..... the TELs going by sea.
Brahmos-2 with ~1000 km range - granted.