When the Scout movement was reborn in Italy after the fascist suppression, there was a need to provide material to raise awareness of Scouting, therefore Sica oversaw the Italian editions of the works of Robert Baden-Powell, often translating them in his own hand.
His diplomatic career, allowing him to travel the world, put him in touch with the realities of Scouts from other countries, which he brought back to Italy.
In the preface to Footsteps of the Founder, László Nagy, the Secretary General of the World Organization of the Scout Movement wrote that the works of Baden-Powell are read in Italian in his own country, rather than English, thanks to the work of Sica.
Sica was serving as Italian ambassador to Somalia when the government of Siad Barre fell during the Somali Civil War in 1991.
As ambassador, he helped facilitate the extraction of a joint North and South Korean diplomatic delegation that had been stranded by the fighting in Mogadishu.