It is important to be prepared to attack every enemy rather than the enemy which you fancy. Tomorrow if USA misbehaves, then it will be important to strike even USA. Same with China, Indonesia, Saudi Arabia etc.
Just check how limited range the Sagarika will be from Bay of Bengal to Pakistan:
View attachment 3170
Now, here is Indonesia, another hostile country (declared war in 1971 against India):
View attachment 3171
Here is if Saudi misbehaves:
View attachment 3172
Here is if China misbehaves:
View attachment 3173
JUST ANSWER THIS QUESTION:
Which adversary can be targeted with Sagarika missile (excluding Bangladesh)?