[4] She began her career with Geo TV's sitcom Nadaaniyaan (2009) and later on appeared in leading role in soap opera Mehmoodabad Ki Malkain (2011).

She took on to supporting roles in several television productions and had a breakthrough and critical success with the thriller Nanhi (2013) which earned her first nomination of Lux Style Award for Best TV Actress.

Further praise came for her portrayals in the family dramatic Sannata (2013-14) and Khuda Dekh Raha Hai (2015) for which she received Best TV Actress nomination at the Lux Style Awards.

[7] Despite persistent rumours of dating her co-star and actor Ahad Raza Mir since they worked in 2018 series Yaqeen Ka Safar, both did not publicly speak about their relationship.

[17] It was an episodic appearance followed by leading roles in several soap operas including, the melodrama Mehmoodabad Ki Malkain,[18][19][20] the family Ahmed Habib Ki Betiyan[17] and supporting roles in primetime political-drama Mastana Mahi,[17][21] and the melodrama Meray Qatil Meray Dildar,[18] the later of which earned her a nomination of Hum Award for Best Supporting Actress.

Her performance as a young troubled child in Asim Raza's Behadd alongside Nadia Jamil and Fawad Khan was praised by critics.

[26][17] Aly then portrayed a victim of split personality disorder in Kashif Nisar's directed Sannata alongside Danish Taimoor and Saba Qamar.

[19] Despite the negative reviews that the series received due to the misleading depicting of the rape, her performance was praised, earning her third nomination as a Best TV Actress at 14th Lux Style Awards.

[17][29] Her first role in 2015 was of submissive girl dominated by her mother's ideologies in Sabiha Sumar's directed Khuda Dekh Raha Hai, earned her another nomination of Lux Style Award for Best TV Actress.

[30][31][32] Later that year, she made her second on-screen appearance with Agha Ali after Khuda Dekh Raha Hai in Kashif Nisar's directed Kis Se Kahoon,[17] where she portrayed a young college student who faces the hurdles there courageously.

[27] Aly then appeared in Anjum Shahzad's directed romance-drama Mera Yaar Miladay opposite Faysal Quraishi which couldn't get wider response.

[38] Aly made her playback singing debut in 2018 with the theme song of O Rangreza, in which she played the character of Sassi, a vibrant and rebellious daughter of a poet.

[40] Her next role was of a university student who gets stiff in her decision of love in Sarmad Khoosat's directed Noor ul Ain, and was paired opposite Imran Abbas.

[43] After the series ended, a reviewer from The News International stated, "Sajal Aly stole the limelight and overshadowed everyone and everything else surrounding the recently concluded play".

[47] The little praise came from her portrayal of a university graduate with nightmare problems in Farhat Ishtiaq's written romantic thriller Yeh Dil Mera, which broadcast on Hum TV.