Utkal University

You have following options to fulfill your dreams of traveling after B.Tech in mechanical engineering:(a) You can appear for civil services examination conducted by UPSC and join Indian Foreign Services.
(b) Join merchant navy as marine engineer.
(c) Develop unique engineering specialisation and join engineering consulting companies.
(d) MBA from Tier I B-school in marketing followed by international trade or marketing.
You can choose from any of the above mentioned options based on your interest to excel in profession.

Christ University is India's no. 1 university to pursue BBA. If you get it, nothing is as better as it.

iitm offers mba in tourism management

IHM is considered good institute for hotel management and tourism

You should do hospitality and tourism course for the same.
Best of luck.

Yes it is a good Institution for travel and tourism and holds a good brand name. However, placements there are highly dependent on your academics and performance.

You should study well in B.Com. You need to score well in CAT and you can choose travel and tourism management in higher rank college as it is a very passionate job. You need excellent proficiency in English. You can also do it from abroad, for that you need to score high in GMAT exam.

You can try for a change in the same company in some another department.

MBA is a postgraduate degree of 2 years in majority of universities and you will take 2 years to complete it as you will not get any exception/ relief in studying of courses because of your P diploma in Travel & Tourism.