As you have asked about the road map directions or route directions to reach IIT Bombay from Chhatrapati Shivaji Terminus, I am giving you information about it, check below for the details

Chhatrapati Shivaji Terminus
Chhatrapati Shivaji Terminus Area, Fort, Mumbai, Maharashtra 400001

Continue to Eastern Fwy
2.7 km
Head south on Dr Dadabhai Naoroji Rd towards Mahapalika Marg
120 m
Turn left onto Walchand Hirachand Marg
350 m
Turn left at Sardar Awar Singh Bedi Chowk onto PD Mello Rd
2.2 km
Follow Eastern Fwy and NH 3 to JVLR. Take the exit from NH 3
23.7 km
Slight right onto Eastern Fwy
13.0 km
Keep right to stay on Eastern Fwy
2.5 km
Keep left at the fork and merge onto Ghatkopar - Mankhurd Link Rd/Jeejabai Bhosale Marg
800 m
Continue straight to stay on Ghatkopar - Mankhurd Link Rd/Jeejabai Bhosale Marg
350 m
Keep right to stay on Ghatkopar - Mankhurd Link Rd/Jeejabai Bhosale Marg
42 m
Turn right onto NH 3
3.2 km
Continue straight to stay on NH 3
3.4 km
Take the exit towards JVLR
350 m
Follow JVLR to YP Rd in IIT Area
2.3 km
Turn left at JVLR Kanjurmarg JN onto JVLR
600 m
Continue straight through Tagore Nagar Jct onto Adi Shankaracharya Marg/JVLR
400 m
Keep right to stay on Adi Shankaracharya Marg/JVLR
1.2 km
Turn right onto YP Rd
24 m

Indian Institute of Technology Bombay
Powai, Mumbai, Maharashtra 400076