When Punjab was in turmoil in terrorist activities, Prof. Sanyal participated as a group leader of West Bengal in the National Integration Peace March in 1983 under the leadership of Late Ms. Nirmala Deshpande and with the blessings of Srimati Indira Gandhi.
Represented India as delegate in 'South Asian Seminar on Legal Aid' held in Kathmandu, Nepal in March 1986.
Prof. Sankar Kumar Sanyal had traversed throughout the country and abroad to propagate peace and harmony on Gandhian principles for last several years. Amongst his efforts are included a delegation to Italy, France, Switzerland and the UK as a member of the 'Gandhi-in-Action' on the occasion of International year of Peace in 1986 with the blessings of Sri Rajiv Gandhi.
Represented India as a delegate to the United Kingdom, being jointly nominated by the Ministry of Rural Development, Government of India and British Government as only NGO representative in a group of seven senior Government officials of India in March - June 1995.
Participated in South West Asia Regional Conference of SERVAS International held in Dhaka, Bangladesh on 10th & 11th December 1999 as the only representative from SERVAS INDIA.
He organized mega-Gandhian events like South Asia Peace Meet and All India Constructive Workers' Conference under the aegis of Akhil Bharat Rachanatmak Samaj headed by late Ms. Nirmala Deshpande at Yuba Bharati Krirangan, Salt Lake in Kolkata in January 2000, which was attended by the then Chief Minister of the state Sri Jyoti Basu and other eminent personalities of the country. It was attended by more than 12,000 delegates from all over the country and neighbouring countries like Pakistan, Bangladesh, Nepal and Sri Lanka which was the first of its kind in Kolkata.
He also participated in an Indian delegation of Association of Peoples of Asia to China from 28th October to 3rd November 2003 led by Late Ms. Nirmala Deshpande on the invitation of Chinese Association of International Understanding visiting Beijing and Shanghai and participated in bilateral dialogues with Chinese Association of International Understanding, State Council Leading Group on Poverty Alleviation and Development, All China Women's Federation, Tibetology Research Center, Shanghai Foreign Affairs Department to foster people to people contact, friendship and understanding amongst the people of Asia for a peaceful and non-violent world and to identify cultural, educational and voluntary organizations in different countries of Asia.
He went to Pakistan from 30th August to 1st September 2004 under the leadership of late Ms. Nirmala Deshpande, MP to promote peace, friendship and brotherhood and strengthening goodwill between the two nations.
As a representative of the Indian Council of Cultural Relations under the Ministry of Cultural Affairs, Government of India, Prof. Sanyal went to Bangladesh from 11th to 16th October 2004 to speak on Gandhian values and their contemporary relevance to various intellectual forums like Bangladesh Bharat Sampriti Parishad, Dhaka University, Gandhi Ashram Trust at Noakhali and Feni, Dhaka Ramakrishna Mission and at Bangladesh Institute of Law and International Affairs, Dhaka.
He represented India as a delegate of Association of People of Asia in the World Social Forum held at Karachi, Pakistan with the aim to promote peace, friendship, brotherhood and strengthening goodwill between different nations from 24th to 29th March 2006 and chaired a symposium on Nuclear Free South Asia with elimination of nuclear stock piles in India and Pakistan and diverting nuclear energy for peaceful purposes.
In the same year he led a 15-member delegation at the conference on the centenary celebration of Satyagraha organized by Gandhi Development Trust in association with Kwa-Zulu Natal Government at the Durban University of Technology in South Africa held from 10th to 13th September 2006. He took the opportunity to visit various places like Phoenix, Pietermaritzbarg and saw invaluable memorabilia on Gandhiji kept for the posterity.
From 4th to 7th December 2008 he represented India in a 15-member delegation at the 50th Anniversary celebration of the Lanka Jatika Sarvodaya Shramadana Sangamaya and a conference on "Concerted Community Action for a Sustainable Life on Earth Fair to All" held at Vishva Niketan International Peace and Meditation Center at Moratuwa, Colombo, Sri Lanka.
