At the 1906 Intercalated Games, Simiriotis competed with Sofia Marinou in the mixed doubles tennis event.

They lost to eventual winners Max and Marie Decugis, and were awarded a silver medal.

[2]: 137 [3][1] In the men's singles event, he lost his quarter final match to Gerard Scheurleer.

[2]: 24 Simiriotis won the singles event at the 1906 and 1908 Panhellenic Tennis Championships [el].

His sister Esmée Simirioti also competed at the 1906 Intercalated Games in tennis, winning the Women's singles event.