is there any choice to do pgdrdm as distance mode

yes their are verious choices .......

Dear Praveen , it has to be done as a full-time course as there are many concepts and practical aspects that have to be learnt and developed by an individual in this course

No, it can be pursued only as full-time degree because the programme consists of three major components, namely, (a) Classroom teaching and interactive learning, (b) Fieldwork (short visits and long visit), and (c) Organisational attachment.