Can I make the sidebar support widgets?

I don’t think the theme I’m using supports widgets. Is it possible to change it?

I have added all ‘widgets’ manually

header.php

<div id="sidebar">
	<ul>
		<li>
			<h3>Search It!</h3>
			<div class="sidebar_section">
				<?php include (TEMPLATEPATH . '/searchform.php'); ?>
			</div>
		</li>
		<li>
			<h3>Calendar</h3>
			<div class="sidebar_section">
				<?php sidebarEventsCalendar();?>
			</div>
		</li>
		<li>
			<h3>Music</h3>
			<div class="sidebar_section">
				<center>
				<embed src="theme.mp3" width="75" height="45" autostart="1" showcontrols="1" type="application/x-mplayer2" pluginspage="https://www.microsoft.com/windows/windowsmedia/download/"> </embed>
				</center>
			</div>
		</li>
		<li>
			<h3>Links</h2>
			<div class="sidebar_section">
				<ul>
					<?php get_links(-1, '<li>', '</li>', '', FALSE, 'id', FALSE, FALSE, -1, TRUE); ?>
				</ul>
			</div>
		</li>
	</ul>
</div>