Sime won the men's 2000m steeplechase at the 2018 Youth Olympic Games in Buenos Aires, Argentina.[2][3]
In 2021, Sime was second in the 3000m steeplechase Ethiopian Olympic trials in behind Bikila Tadese Takele with both men running personal bests, Sime ran 8:12:11 to secure the qualification time for the delayed 2020 Tokyo Olympics and was later chosen in the Ethiopian squad.[4][5] However, Sime did not compete.[6]
He ran a new personal best of 8:10.73 at the Paris Diamond League event in June 2023, in the same race that saw his compatriot Lamecha Girma broke the world record in the men's 3,000 metres steeplechase.[7] He ran a new personal best in July 2023 at the Diamond League event in Monaco, running 8:10.56 to finish third behind winner Simon Koech.[8]
He competed in the 3000 metres steeplechase at the 2023 World Athletics Championships in Budapest in August 2023.[9] In 2024, Sime set a new PB of 8:02.36 at the Meeting de Paris, holding off the fast-finishing Amos Serem to win.[10] He competed in the 3000 metres steeplechase at the 2025 Xiamen Diamond League event in China, in April 2025.[11] The following weekend, he secured a victory in the 3000m steeplechase at the 2025 Shanghai Diamond League, running a time of 8:07.92 to win from Kenya's Edmund Serem.[12]
In July 2025, he was provisionally named as a reserve for the Ethiopian team for the 3000 metres steeplechase at the 2025 World Athletics Championships in Tokyo, Japan.[13] He placed eighth in the 3000 metres steeplechase at the Diamond League Final in Zurich on 28 August.[14]
