[17] In August 2020, in the final round of matches in the 2019–20 Premier League Tournament, Chandimal scored 354 not out, batting for Sri Lanka Army Sports Club.

He made his debut against Zimbabwe, scoring an unbeaten 10 as his side cruised to a nine-wicket win and then registered his maiden international century by scoring 111 runs off 118 balls against India, an innings that helped his side both win the match (by six wickets) and knock India out of the tournament.

He led Sri Lanka in first group stage of the 2014 ICC World Twenty20, until was suspended for slow over rate[24] and subsequently lost the place in the team for the remainder of the tournament.

Chandimal holds the joint record for taking the most catches in a single T20I as a fielder (4) along with Darren Sammy, Ajinkya Rahane, Peter Borren, Corey Anderson and Babar Hayat.

[25] During 2015 ICC Cricket World Cup, against Australia in Sydney, Chandimal scored 50 off 22 balls, this was the fastest fifty by a Sri Lankan batsman in Cricket world cup history, before Angelo Mathews scored a 20-ball fifty, where Sri Lanka had a massive 377 target to chase.

He missed the Sri Lankan record, when he was declared LBW by Adam Zampa on 48, just short of 2 runs for Chandimal's sixth consecutive fifty.

[30] He played in the third ODI as the opener with Niroshan Dickwella and scored 37 runs, when he hit by a bouncer and injured his right thumb.

After the conclusion of Sri Lanka's innings, media reported that he has a hairline fracture and ruled out of the Indian tour.

During the 2014 ICC World Twenty20, he stepped down from the captaincy after injury and suspension due to slow over rate and later Lasith Malinga appointed as the captain.

[34][35] However, after many poor performances in bilateral series and in 2017 ICC Champions Trophy, Chandimal was dropped from limited over squads.

Sri Lanka won the match by 4 wickets at the end, by chasing massive total of 388 runs.

[44][45] With the magical spin from maestro Rangana Herath and Dilruwan Perera, Sri Lanka finally won the match by 21 runs, despite a low score in the second innings.

[53] However, in the first match against Zimbabwe in Bangladesh Tri-series, Mathews was sidelined with a right hamstring injury and removed from the squad for three weeks.

He was there at the end and held firm through sustained pressure from the South African pack to see Sri Lanka home with an unbeaten 36 runs.

Dimuth Karunaratne was named as the stand-in captain for the tour, while Chandimal was released to play domestic cricket and regain his form with the bat.

[63] On 8 March 2021, Sri Lanka tour of West Indies, during 3rd T20I match Chandimal scored his fifth T20I half century.

[66] However, after the impressive performances in the SLC Invitational T20 League, he was included into squad for the South African series in September 2021.

With two centuries, Sri Lanka piled a mammoth first innings total of 506 and finally won the series 2–0.

[70][71] In the Australian Test series in July 2022, Sri Lanka suffered a huge defeat, where the match ended in three days.

However, on 9 July 2022, he scored a brilliant unbeaten 205 runs in the second Test and Sri Lanka posted a total of 554 courtesy of Chandimal's double hundred.

[75] Chandimal was a part of the team in 6 test matches in 2022, batted 10 innings and scored 719 runs averaging 102.71 including the double century against Australia.

[80][81] With the two centuries, Sri Lanka piled a total of 439 and eventually won the one-off test series by 10 wickets.

[82] Chandimal was promoted to the number 3 position in the batting order with New Zealand tour of Sri Lanka in September 2024.

Eventually, Sri Lanka won the match by an innings and 154 runs and rises to the third in the World Test Championship table.

[83][84] During the second Test against West Indies at St. Lucia on 17 June 2018, Chandimal was found to be guilty of making ball tampering incidence.

The incident got worse when coach Chandika Hathurusinghe and manager Asanka Gurusinha were also involved in the moment with the match referee and umpires.

[87] Over the next two hours, several animated discussions took place between management and cricket officials, largely due to the fact that the incident has informed the next morning.

With that, Srinath took a decision and asked Sri Lanka to take the field before 11:30 am (the scheduled start had been 9:30), or forfeit the game.

[91] On 11 July 2018, ICC concluded its hearing on the trio, who had pleaded guilty to a level three spirit of cricket offence.

[92][93] On 16 July 2018, independent Judicial Commissioner handed down a further eight suspension points with maximum possible punishment for their spirit of cricket offence and suspended for four ODIs as well.