Your concerns regarding low GMAT are valid but a low GMAT score can certainly be offset by submitting a good essay and working hard on your application and interviews. Most schools see a combined of all these things to grant an admission.
Your work experience is decent and your involvement in social activities can be highlighted in your essays as most Business schools do look for it. However you would need to cleverly prepare yourself for questions like why you had a low GMAT score, the reasons you want to switch from IT to management, your rationale behind applying for a specific B school, so on and so forth.
You are in perfect stage of your career and a 4-5 years of work experience is what most B Schools look for.
As for which B schools you can apply for an MBA in Supply Chain Management, here is a list of a few of them along with the kind of program they offer:
1. University of Michigan (Master of Supply Chain Management) - A 1-year master's program housed in Michigan's Business School (Ross). With internship
2. Georgia Tech (MBA major in Operations Management)
3. Rochester Institute of Technology (MBA major in Supply Chain Management) - Can be completed in a little less than 2 years. Can major in 2 concentrations.
4. Arizona State University (MBA major in Supply Chain Management) - One of the better-known schools in the field of SCM.
5. University of Cincinnati (MBA major in Operations Management) - Can be completed in 15 months, and this includes an internship! The business school has a research center in Supply Chain Management (http://www.business.uc.edu/supplychain
6. Northwestern University, Kellogg School (MBA major in Operations Management) -
There are many more but the above list comprises of a few good ones you should definitely target. It is highly advisable in your case to focus on your application evaluation essays. This is where you can demonstrate your leadership qualities, achievements, professional vision and other abilities. A well presented and perfectly written essay is absolutely critical to make a strong case for yourself during the final interview and more so when you have an average GMAT score.
It is highly recommended to seek assistance from professional consultants for guidance who can more closely review your situation and provide you with a list of B Schools where you would have chances of converting your application to admission. You should also get your essays reviewed from them before sending it along with your application to better your prospects.
You can visit http://www.general-ed.com/MBA-essay-analysis
to learn more about professional essay evaluation services and http://www.general-ed.com/MBA-essay-analysis
to see how General Ed can help you with MBA counseling and interview preparation.
Also if you happen to be based out of either Delhi, Bangalore or Mumbai, you can attend a MBA workshop by Prof A.K Kannan, Dean Admissions ISB along with alumnus of various global B-Schools during the dates mentioned in this links http://www.general-ed.com/workshops-and-seminars
Feel free to post any other query or concern that you might have.