"He leaves us sad & devastated. RIP Lance Naik Hanamanthappa. The soldier in you remains immortal. Proud that martyrs like you served India," Modi tweeted.
The soldier died today, three days after he was miraculously rescued alive from beneath tonnes of snow at a height of 19,600 feet after the February 3 avalanche hit.
The 33-year-old soldier of the 19th Battalion of Madras Regiment is survived by his wife Mahadevi Ashok Bilebal and two-year-old daughter Netra Koppad.
(REOPENS DEL25)
Congress President Sonia Gandhi also expressed deep shock and profound grief over the death of Koppad.
"During his life, the braveheart son of India united the entire nation in praying for him and has every citizen grieving for him today," she said.
"He fought till his last displaying utmost valour, courage and determination, which is the hallmark of our Armed Forces," she said in a message extending her deepest condolence to Koppad's family and loved ones.
Condoling Koppad's death, West Bengal Chief Minister Mamata Banerjee expressed her sadness.
Northern Army Commander Lt Gen D S Hooda also condoled
Koppad's death saying, "Hanamanthappa was a brave and highly motivated soldier. With his indomitable spirit, courage and unmatched human endurance, he survived the extreme cold and inhospitable conditions buried under the ice on Siachen.