Sharma, playing in the company of former two-time Open winner Padraig Harrington, was three-over through 11 holes before finding his first birdie of the day.
Starting on the 10th, Shubhankar Sharma, who had 70-67-76 on first three days, birdied 12th, 13th, 17th and 18th to turn in a fine four-under in his first nine.
From even par through 12, he fell to five-over 76 and from being inside Top-10 at one point, he ended at T-47 at the wet Renaissance Club.
Sharma is scheduled to play next week in Spain. Justin Walters grinded it out for 71 to open up a one-shot lead after day two. He had a superb 64 on the first day.
Sharma, who had three birdies, one bogey and one double on par-4 10th as conditions were wet, will need a good second round to make the cut.
Sharma hit a couple of birdies on the first two holes but was then unable to maintain the tempo at the Honbury Manor Marriott Hotel and Country Club course.
In an interview to The New Indian Express, Gurbaaz Mann, Sharma's long-time mentor, lifts the lid on what life has been like inside the bio-bubble.
Sharma, who celebrated his 24th birthday on Tuesday, leaves early next week and will be in time for the start of Hero Open on Thursday.
Even though the likes of Gaganjeet Bhullar and SSP Chawrasia have said that they may completely miss the European Tour in 2020 because of the pandemic, Sharma is itching to get back to action.
It also marks the comeback of sports in India post the coronavirus lockdown was imposed on March 25.
India's top golfers returned to practice at courses across the country after weeks of inactivity brought about by the COVID-19 pandemic.
He attacked the off-season with renewed vigour, working on technical things as well as reducing muscle mass from his body.
A look at sportspersons who made the most of 2019 and those who had a forgettable year.
Barring Anirban Lahiri, Shubhankar Sharma and Gaganjeet Bhullar, all top Indians will tee off at the Phoenix Gold Golf and Country Club, hoping to break the duck.