He entered politics from the United National Party under the guidance of
Lalith Athulathmudali, a lecturer at the Ceylon Law College. Lokubandara first entered parliament in 1977 representing the
United National Party (UNP), defeating Dissanayake former Cabinet Minister of Health's son-in-law
W. P. G. Ariyadasa who did not contest the 1977 general election. He was a backbencher in the J. R. Jayewardene government for 10 years. He was initially appointed to the non-cabinet post of Minister of Indigenous Medicine. In 1989, Lokubandara was appointed a Cabinet Minister when he was given the Ministries of Cultural Affairs, Education and Media by President
Ranasinghe Premadasa. He also appointed a committee of astrologers to compile the Sinhala New Year auspicious calendar and to make the Sinhala New Year anointing ceremony as a state sponsored event. During his tenure as the Minister of Education, he also conducted seminars and workshops for scholars to educate students and teachers on the correct writing of the Sinhala language. He also declared 2 March as Sinhala Language Day and special programs were launched on that day.
Speakership Lokubandara was elected as the Speaker of Parliament on 4 April 2004, His election as 16th Speaker of Parliament was announced at 7.15 pm. After assuming office, he urged the members of the parliament to safeguard democracy and "move away from confrontational politics marching beyond petty party politics". ==Literary work==