The "obvious" one:  The 1971 Indo-Pakistan war, which brought about regime change in East Pakistan/Bangladesh.

In 1971, following a devastating typhoon, rebels in what is now Bangladesh began an independence campaign.  The Government, based in "West" Pakistan responded violently and a quite brutal civil war ensued.

It the end of 1971, and following attacks from West Pakistan on India, India began a full-scale military operation in support of the rebels.  This resulted in the defeat of the Pakistani government in Bangladesh, and the creation of a new Bangladeshi government in that region.

The actions of India in the Indo-Pakistan war were clearly intended to break about regime change in East Pakistan.