Indian Institute of Space Science and Technology (IIST) offered following program for admission :
4-Year B.Tech. ( Aerospace Engineering )
4-Year B.Tech. ( Avionics )
5-Year Dual Degree (B.Tech. + M.S./M.Tech.)
The 5-year Dual Degree programme leads to B.Tech. degree in Engineering Physics and any of the following Post-Graduate degree specializations:
(i) M.S. (Astronomy & Astrophysics) (ii) M.S. (Earth System Science) (iii) M.S. (Solid State Physics) (iv) M.Tech. (Optical Engineering) (There is no exit option at the end of four years).Seat Matrix for Different Programmes

As you want to apply online so I am telling process to fill Application Form:
Visit the official site of Indian Institute of Space Science and Technology (IIST).

Enter details asked in the form such as name, contact details, educational qualification, JEE Main and Advanced information.

After completing online registration, download and print the challan and remit the registration fee.

Make payment for IIST application form 2016.

Enter the bank transaction details by logging into the online application portal using Registration Number and Password.

Upload the scanned image in PDF/JPEG format of the Institute copy of Challan countersigned by Bank.

Key Dates for Admission Process
Apply for CBSE JEE Main 2016 between 01st Dec 2015 to 31st Dec 2015.
Appear in the Joint Entrance Examination (Mains) being conducted by CBSE on 3rd April 2016 and 09th-10th April 2016
Qualify in the examination to be eligible for JEE Advanced 2016.
Apply for IIT JEE Advanced 2016 between 29th April 2016 to 04th May 2016.
Appear in the Joint Entrance Examination (Advanced) being conducted by IITs on 22nd May 2016.
Check score obtained in JEE Advanced 2016. IITs shall publish score on 12th June 2016.
Get minimum qualifying cut off marks as specified by IIST in JEE Advanced 2016.
Apply for IIST 2016 admissions.

Address

Indian Institute of Space Science and Technology
Valiamala Road, Valiamala
Thiruvananthapuram, Kerala 695547